How to Read a Cannabinoid COA: THC, CBD, THCP, HHCP, Terpenes & Contaminants

Table of Contents:

·         What Is a Cannabinoid COA and Why Is It Important?

·         How to Confirm the Laboratory, Date and Batch Number

·         How to Read THC, CBD, THCP and HHCP Test Results

·         How to Understand Potency Units and Total Cannabinoid Values

·         How to Read the Terpene Analysis Panel

·         Solvents, Pesticides, Heavy Metals and Microbiology Tests

·         Common COA Warning Signs and a Practical Checklist

·         Frequently Asked Questions About Cannabinoid COAs

1)      What Is a Cannabinoid COA and Why Is It Important?

A Certificate of Analysis, commonly called a cannabinoid COA, is a laboratory report that provides information about the composition, potency and tested quality of a cannabinoid product. It can help buyers, retailers and manufacturers confirm whether a product matches its label and meets the required quality specifications.

Understanding how to read COA documents is therefore an important part of evaluating CBD, CBG, CBN and other cannabinoid products. Instead of relying only on packaging or marketing claims, consumers and businesses can use laboratory results to make more informed purchasing decisions.

What Does COA Mean?

COA stands for Certificate of Analysis. It is a document produced by a laboratory after testing a product, ingredient or production batch.

A typical cannabinoid COA may include results for:

• Cannabinoid potency
• THC concentration
• Terpene content
• Pesticide residues
• Heavy metals
• Residual solvents
• Microbial contamination
• Mycotoxins
• Moisture content or water activity

Not every COA contains all these tests. Some reports only show cannabinoid potency, while more comprehensive reports include several contaminant-testing panels. Buyers should therefore check which analyses were actually completed rather than assuming that every possible safety test is included.

Why Is a Cannabinoid COA Important?

It Confirms Cannabinoid Potency

One of the main purposes of a cannabinoid COA is to identify which cannabinoids are present and in what concentrations.

Depending on the product, the report might list:

• CBD or CBDA
• THC or THCA
• CBG or CBGA
• CBN
• CBC
• Other detectable cannabinoids

These results allow buyers to compare the laboratory-tested composition with the strength advertised on the label. For example, a product marketed as containing 20% CBD should have laboratory results reasonably consistent with that claim.

It Helps Verify THC Content

THC levels can affect a product’s legal classification and suitability for sale in a particular market. A COA may report delta-9 THC, THCA and total THC separately.

Anyone learning how to read COA results should understand that “not detected” is different from an absolute guarantee that a substance is absent. It normally means the laboratory did not detect it above the method’s reporting or quantification limit.

THC laws and permitted limits vary by country, product type and intended use. A laboratory result alone does not prove that a product is legally compliant in every market.

It Supports Label Accuracy

A trustworthy product label should be supported by batch-specific testing. The batch or lot number on the cannabinoid COA should correspond with the number printed on the product or its packaging.

If the numbers do not match, the report may belong to a different production batch. This matters because cannabinoid concentrations and contaminant results can vary between batches, even when the products look identical.

It Can Identify Potential Contaminants

Cannabinoid materials can be exposed to contaminants during cultivation, extraction, processing or storage. A comprehensive COA may screen for substances such as:

• Lead, arsenic, cadmium and mercury
• Pesticide residues
• Residual extraction solvents
• Yeast, mold and harmful bacteria
• Aflatoxins and other mycotoxins

Each section should show the tested result and, where applicable, the laboratory’s action limit. Results are often marked as “Pass,” “Fail,” “ND” or “Below LOQ.”

A potency-only report should not be described as a complete safety report because it does not confirm that contaminant screening was performed.

Who Produces a Cannabinoid COA?

A COA should ideally be issued by an independent third-party laboratory rather than created solely from the manufacturer’s internal testing.

Independent testing can provide greater confidence that the results were produced separately from the company selling the product. Buyers should look for clear laboratory details, including:

• Laboratory name and contact information
• Accreditation details
• Sample identification number
• Date received and date tested
• Testing methods
• Authorized signature or approval
• QR code or verification link, when available

ISO/IEC 17025 accreditation is a useful quality indicator because it relates to a laboratory’s testing competence. However, buyers should also confirm that the specific analytical method falls within the laboratory’s accredited scope.

How to Read COA Information Correctly

When learning how to read COA documents, begin with the identification details rather than jumping directly to the cannabinoid percentages.

1. Match the Batch Number

Check that the batch or lot number on the report matches the product. Avoid relying on an undated or generic COA that cannot be connected to a specific batch.

2. Check the Testing Date

Laboratory results should be recent enough to represent the product being sold. An old report may relate to a previous production batch or formulation.

3. Review the Sample Description

Confirm that the laboratory tested the correct type of sample, such as flower, extract, oil, edible or vape formulation. Results from a raw ingredient should not automatically be treated as proof that the finished product was tested.

4. Understand the Units

Cannabinoid results may be shown as:

• Percentage by weight
• Milligrams per gram
• Milligrams per milliliter
• Milligrams per unit or package

For solid products, 1% by weight generally equals 10 milligrams per gram. However, liquids may require information about density, volume and total container size before the laboratory result can be compared accurately with the label.

5. Look for ND, LOD and LOQ

Common laboratory abbreviations include:

• ND: Not detected
• LOD: Limit of detection
• LOQ: Limit of quantification
• Pass: Result meets the laboratory’s stated specification
• Fail: Result exceeds or does not meet the stated specification

The LOD is the smallest amount the method can detect, while the LOQ is the smallest amount it can reliably measure and report numerically.

6. Review Every Testing Panel

Do not stop after checking CBD and THC results. Review the contaminant sections and confirm whether each relevant panel was actually tested. Blank sections or missing pages should not be interpreted as passing results.

2)      How to Confirm the Laboratory, Date and Batch Number

A Certificate of Analysis is only useful when it can be connected to a genuine laboratory, a specific testing date and the correct product batch. Before reviewing cannabinoid potency or contaminant results, buyers should verify these basic identification details.

When learning how to read COA documents, start at the top of the report. Confirming the laboratory, testing date and batch number helps determine whether the cannabinoid COA is authentic, current and relevant to the product being assessed.

Why COA Identification Details Matter

A laboratory report may display impressive CBD, THC, THCP or HHCP results, but those figures have limited value if the document cannot be linked to the actual product.

The identification section helps answer three essential questions:

• Which laboratory tested the sample?
• When was the sample received and analyzed?
• Which product and production batch do the results represent?

If any of these details are missing or inconsistent, the report should be investigated before the product is purchased, stocked or supplied.

How to Confirm the Laboratory

A legitimate cannabinoid COA should clearly identify the laboratory responsible for testing. Look for the laboratories:

• Full legal or trading name
• Physical address
• Telephone number or email address
• Website
• Accreditation information
• Report or certificate number
• Authorized signature or digital approval

The laboratory’s branding should appear consistently throughout the document. However, a logo alone does not prove authenticity because logos and report layouts can be copied.

Visit the Laboratory’s Official Website

Use an independently located official website rather than relying only on a link printed on the COA. Compare the contact information on the report with the laboratory’s published details.

Some laboratories provide an online verification portal where a report number, sample ID or QR code can be entered. If available, use this system to confirm that the electronic report matches the document supplied by the seller.

Check the QR Code Carefully

Many COAs include a QR code linking to the laboratory’s original report. Scan it and confirm that:

• It opens the laboratory’s genuine domain
• The report number matches
• The product and batch details match
• The dates are identical
• The results have not been changed
• The full report is available

A QR code that directs to the supplier’s homepage, a generic file-sharing page or an unrelated report does not independently verify the document.

Review Laboratory Accreditation

Many cannabinoid laboratories operate under ISO/IEC 17025 accreditation. This standard relates to the competence of testing and calibration laboratories.

Check whether:

• An accreditation number is shown
• The accreditation remains valid
• The issuing accreditation body is identifiable
• The relevant cannabinoid or contaminant methods appear within the laboratory’s accredited scope

Accreditation can strengthen confidence in the testing process, but it does not automatically mean every analysis shown on the report is included within the accredited scope.

Contact the Laboratory if Necessary

If the document looks incomplete or altered, contact the laboratory using details obtained independently from its official website. Provide the report number or sample ID and ask whether the laboratory issued the cannabinoid COA.

Do not rely exclusively on contact information supplied by an unknown retailer, manufacturer or distributor.

Which Dates Should Appear on a COA?

Understanding how to read COA dates is important because a report may contain several different dates. These can include:

• Sample received date
• Sample preparation date
• Testing or analysis date
• Report issued date
• Report revised date
• Certificate approval date

Each date serves a different purpose.

Sample Received Date

This shows when the laboratory took possession of the sample. It can help establish the testing timeline and reveal whether there was a long delay before analysis.

Testing or Analysis Date

This indicates when the laboratory performed the analytical work. For multi-panel reports, different tests may have different completion dates.

For example, cannabinoid potency may be tested on one date, while microbiological or heavy-metal testing may be completed several days later.

Report Issue Date

The issue date shows when the laboratory released or approved the final report. It may be later than the analysis date, especially when several test panels are included.

Revised Date

A revised report should explain what changed. It may correct a customer name, sample description, calculation or result. If a revision date appears without an explanation, request clarification from the laboratory or supplier.

How Recent Should the Testing Be?

There is no single universal period after which every cannabinoid COA becomes invalid. The appropriate testing frequency depends on factors such as:

• Product type
• Batch size
• Manufacturing process
• Storage conditions
• Shelf life
• Stability data
• Applicable market requirements
• Company quality-control procedures

The most important point is that the report should relate to the specific batch currently being sold. A recent date does not help if the batch number does not match the product.

An old COA may also be unsuitable if it represents a previous formulation, supplier, harvest or production run.

How to Confirm the Batch Number

The batch number sometimes called a lot number is one of the most important details on a cannabinoid COA. It connects the laboratory result with a defined group of products manufactured or processed under similar conditions.

The number on the COA should match the number printed on the:

• Product label
• Outer packaging
• Container
• Retail box
• Wholesale specification sheet
• Supplier invoice or delivery record
• Internal traceability documents

The match should be exact. Small differences, missing characters or additional prefixes may indicate that the report belongs to another batch.

Batch Number, Lot Number and Sample ID

These numbers can be confusing when learning how to read COA documents because they do not always mean the same thing.

A product code alone is usually not enough to establish batch-level traceability. The COA should include an identifier that matches the specific production lot.

Confirm the Product Description

In addition to the batch number, examine the product or sample description. It should accurately identify what the laboratory tested, such as:

• CBD oil
• Cannabinoid distillate
• Hemp flower
• CBD isolate
• Vape liquid
• Gummy
• Topical product
• Raw ingredient

The description should also match the product’s strength, flavor, formulation or package size when these details are relevant.

A report for bulk CBD distillate does not automatically confirm the composition or safety of a finished vape product made with that ingredient. Similarly, a raw-material COA should not be presented as finished-product testing unless this is stated clearly.

3)      How to Read THC, CBD, THCP and HHCP Test Results

A cannabinoid potency panel shows which cannabinoids a laboratory detected and their measured concentrations. Depending on the product and laboratory, the report may include CBD, THC, THCP, HHCP and their acidic or structural variants.

However, a number on a cannabinoid COA should not be viewed in isolation. To interpret the results properly, readers must check the cannabinoid name, measurement unit, detection limit, testing method and type of sample analyzed.

This guide explains how to read COA potency results while recognizing the additional uncertainty surrounding newer cannabinoids such as THCP and HHCP.

What Is a Cannabinoid Potency Panel?

The potency panel is the section of a cannabinoid COA that lists the cannabinoids included in the laboratory’s analysis. It commonly appears as a table containing:

• Cannabinoid name
• Abbreviation
• Result
• Measurement unit
• Limit of detection
• Limit of quantification
• Testing method
• Pass or fail status, where applicable

Traditional cannabinoid panels often include CBD, CBDA, delta-9 THC, THCA, CBG, CBGA, CBC and CBN. Expanded panels may also list delta-8 THC, delta-10 THC, THCP, HHCP or other emerging compounds.

The presence of a cannabinoid’s name in the table does not mean it was found. Always review the reported result beside it.

How to Read CBD Results

CBD may appear in several forms on a laboratory report.

CBD

CBD refers to cannabidiol in its neutral or decarboxylated form. It is commonly measured in oils, isolates, vape formulations, cosmetics, extracts and finished cannabinoid products.

CBDA

CBDA stands for cannabidiolic acid. It is the natural acidic precursor to CBD and is often found in raw or minimally heated hemp material.

Heat can convert CBDA into CBD through a process called decarboxylation. For that reason, a hemp flower or raw extract may contain both CBD and CBDA.

Total CBD

Some laboratories calculate total CBD using the following formula:

Total CBD = CBD + (CBDA × 0.877)

The conversion factor accounts for the approximate loss of carbon dioxide when CBDA is converted into CBD.

When learning how to read COA results, check whether the laboratory reports CBD, CBDA and total CBD separately. Do not add CBD and CBDA directly without considering the conversion factor.

Comparing CBD Results With the Label

The result should be compared using matching units. For example:

• 20% CBD equals approximately 200 mg/g in a solid or extract
• 10% CBD equals approximately 100 mg/g
• 5% CBD equals approximately 50 mg/g

For oils and other liquids, converting a percentage into milligrams per bottle may require the product’s weight, volume and density. A milligram-per-gram result should not automatically be treated as milligrams per milliliter.

How to Read THC Results

THC results require careful attention because multiple THC-related compounds may appear on the same cannabinoid COA.

Delta-9 THC

Delta-9 THC is the main intoxicating form of THC associated with cannabis. On a report, it may appear as:

• Δ9-THC
• Delta-9 THC
• D9-THC
• THC

If a laboratory uses the general abbreviation “THC,” check the report’s definitions to confirm which isomer it means.

THCA

THCA is tetrahydrocannabinolic acid, the acidic precursor to delta-9 THC. It is common in raw cannabis and hemp flower.

Heating THCA can convert part of it into delta-9 THC. Consequently, a product with a low measured delta-9 THC level may still have a higher potential total THC value when THCA is present.

Total THC

Total THC is often calculated using:

Total THC = Delta-9 THC + (THCA × 0.877)

The factor reflects the approximate molecular-weight change that occurs during decarboxylation.

Check the laboratory’s footnotes because formulas and reporting conventions can differ. The value reported as total THC should not be confused with the amount of delta-9 THC measured directly in the sample.

Other THC Isomers

An expanded panel may include:

• Delta-8 THC
• Delta-10 THC
• Exo-THC
• THCV
• Other THC-related compounds

These are chemically distinct entries. Do not combine them unless the report or relevant regulatory framework specifically requires a defined calculation.

How to Read THCP Results

THCP stands for tetrahydrocannabiphorol. It is structurally related to THC but has a longer alkyl side chain.

On a cannabinoid COA, it may be listed as:

• Δ9-THCP
• Delta-9 THCP
• THCP
• Tetrahydrocannabiphorol

Readers should verify the exact analyte because the general term THCP may not explain which form or isomer was tested.

Check Whether THCP Was Measured Directly

The report should state that THCP was included in the laboratory’s analytical panel. It should not be inferred from a total cannabinoid value or estimated from the product formulation.

A credible quantitative THCP result should ideally be supported by:

• A validated analytical method
• A suitable THCP reference standard
• Clear LOD and LOQ values
• An identified measurement uncertainty
• Separation from potentially interfering compounds
• An accredited or otherwise demonstrably competent laboratory

Be Careful With THCP Potency Claims

Preclinical research suggests that THCP interacts strongly with cannabinoid receptors, but a receptor-binding result does not provide a simple, reliable conversion into human intoxicating strength.

Claims that THCP is an exact number of times “stronger than THC” should therefore be treated cautiously. A cannabinoid COA measures chemical concentration; it does not prove how strongly a product will affect an individual.

Confirm the Units

THCP may be present at much lower concentrations than CBD or major THC cannabinoids. Its result might therefore be shown as:

• Percentage
• mg/g
• mg/mL
• µg/g
• Parts per million

For example, 1 mg/g equals 0.1% by weight. Confusing milligrams with micrograms can produce a thousand-fold interpretation error.

How to Read HHCP Results

HHCP, also written as HHC-P or hexahydrocannabiphorol, is a hydrogenated cannabinoid related to THCP. Commercial HHCP materials may contain different stereoisomers and production-related compounds.

Testing HHCP can be more complicated than testing established cannabinoids such as CBD and delta-9 THC.

Confirm What “HHCP” Means on the Report

The cannabinoid COA should clearly identify the analyte. Look for information explaining whether the laboratory measured:

• Total HHCP
• A specific HHCP isomer
• A mixture of stereoisomers
• HHC and HHCP separately
• Other related or unidentified compounds

A single “HHCP” entry may not describe the complete composition of a complex semi-synthetic mixture.

Check the Laboratory’s Testing Capability

Because HHCP is a relatively new commercial cannabinoid, not every laboratory has a validated method or appropriate reference material for it.

Before relying on the result, check whether the report provides:

• The analytical method
• The reference standard used
• LOD and LOQ information
• Chromatographic separation details
• Measurement uncertainty
• Relevant accreditation scope
• A clear explanation of isomer reporting

An HHCP result from a general cannabinoid screening panel may be less reliable if the laboratory cannot demonstrate that its method distinguishes HHCP from related compounds.

Avoid Interpreting HHCP Results as Clinical Evidence

The measured percentage tells the reader how much of the target analyte the laboratory reported. It does not establish safe intake, human potency, duration, impairment level or long-term health effects.

Human evidence for HHCP remains limited. Product claims should not go beyond what the test actually demonstrates.

Understanding Results, ND, LOD and LOQ

Knowing how to read COA abbreviations prevents common misunderstandings.

Term	Meaning
ND	Not detected above the method’s detection threshold
LOD	Lowest concentration the method can detect
LOQ	Lowest concentration the method can quantify reliably
<LOQ	Detected or potentially present, but below reliable quantification
N/A	Not applicable or not analyzed, depending on the report
NT	Not tested
Pass	Meets the stated specification or action limit
Fail	Does not meet the stated specification or action limit

“Not detected” does not necessarily mean absolute zero. It means the compound was not detected above the stated capability of that test.

Similarly, “not tested” must not be interpreted as a passing result.

Understanding the Measurement Units

A potency result may be expressed in several formats:

Unit	General meaning
%	Grams per 100 grams, usually by weight
mg/g	Milligrams per gram
mg/mL	Milligrams per millilitre
µg/g	Micrograms per gram
ppm	Parts per million
mg/unit	Milligrams in one defined product unit

Useful conversions include:

• 1% = 10 mg/g
• 0.1% = 1 mg/g
• 1 mg/g = 1,000 µg/g
• 1 mg/g = approximately 1,000 ppm

These relationships apply when the units share a compatible weight basis. Liquid calculations may require density data.

Example of a Cannabinoid Potency Table

A simplified laboratory table might look like this:

In this example, HHCP cannot be described as absent because the laboratory did not test for it. THCA was tested but not detected above the method’s detection threshold.

This example is illustrative only. Actual results must be interpreted using the laboratory’s stated methods, units and reporting limits.

Compare the Results with the Product Label

After interpreting the potency table, compare the laboratory values with the product’s advertised composition.

Check whether:

• The correct batch was tested
• The sample description matches the finished product
• CBD and THC values are reasonably consistent with the label
• THCP or HHCP claims are supported by individual results
• The reported units match the units on the packaging
• Total cannabinoid claims have a defined calculation
• The report covers the entire formulation rather than only one ingredient

A label may state milligrams per bottle, while the COA states milligrams per gram. These values cannot be compared directly without knowing the product’s total weight or density.

Watch for Unexpected Cannabinoids

A report may reveal cannabinoids that are not declared on the label. Unexpected delta-8 THC, delta-9 THC, THCP, HHCP or other compounds may indicate:

• Cross-contamination
• Incomplete purification
• Incorrect formulation
• Ingredient variability
• Degradation
• Misidentification
• Limitations in the analytical method

Unexpected results should be discussed with the supplier and laboratory. They should not automatically be dismissed as insignificant.

4)      How to Understand Potency Units and Total Cannabinoid Values

A laboratory potency panel shows how much CBD, THC and other cannabinoids were measured in a tested sample. However, the results may be reported using percentages, milligrams per gram, milligrams per milliliter or milligrams per product unit. Understanding these measurements is essential when reviewing a cannabinoid COA and comparing laboratory results with a product label.

Potency figures can easily be misinterpreted when the units, sample type or calculation method are overlooked. A result of 100 mg/g, for example, does not mean the same thing as 100 mg/mL or 100 mg in the entire container.

What Does Cannabinoid Potency Mean?

Cannabinoid potency refers to the measured concentration of one or more cannabinoids in a sample. Depending on the product, a laboratory may test for:

• CBD and CBDA
• Delta-9 THC and THCA
• CBG and CBGA
• CBC
• CBN
• Delta-8 THC
• THCV
• THCP
• HHCP
• Other detectable cannabinoids

The cannabinoid COA should list each tested compound separately, together with its result and unit of measurement.

A higher result indicates a greater concentration of that specific cannabinoid. However, potency does not automatically confirm overall product quality, safety or legal compliance.

Common Potency Units on a Cannabinoid COA

Percentage by Weight

A percentage result usually describes how many grams of a cannabinoid are present in every 100 grams of material.

For example:

• 1% equals 1 gram per 100 grams
• 10% equals 10 grams per 100 grams
• 20% equals 20 grams per 100 grams

Percentage by weight is often written as % w/w, meaning weight by weight. It is commonly used for cannabis flower, hemp biomass, concentrates, isolates and other solid or semi-solid materials.

A product containing 15% CBD has approximately 150 mg of CBD per gram of material.

Milligrams per Gram

Milligrams per gram, written as mg/g, show how many milligrams of a cannabinoid are present in one gram of the tested sample.

The basic relationship is:

1% = 10 mg/g

Therefore:

Percentage	Equivalent mg/g
0.1%	1 mg/g
0.2%	2 mg/g
1%	10 mg/g
5%	50 mg/g
10%	100 mg/g
20%	200 mg/g
50%	500 mg/g
90%	900 mg/g

To convert mg/g into a percentage, divide the mg/g result by 10.

For example:

180 mg/g ÷ 10 = 18%

To convert a percentage into mg/g, multiply the percentage by 10.

For example:

25% × 10 = 250 mg/g

These conversions apply when both results are expressed on the same weight basis.

Milligrams per Milliliter

Milligrams per milliliter, written as mg/mL, are frequently used for oils, tinctures, vape liquids and other liquid formulations.

A result of 20 mg/mL means that each milliliter of the tested liquid contains 20 mg of the measured cannabinoid.

If a 10 mL bottle contains 20 mg/mL CBD, its theoretical total CBD content is:

20 mg/mL × 10 mL = 200 mg CBD

However, this calculation assumes that:

• The bottle contains exactly 10 mL
• The product is evenly mixed
• The laboratory result represents the finished product
• The stated volume is accurate

A mg/mL value should not automatically be treated as equal to mg/g. Converting between them requires the density of the liquid.

Milligrams per Product Unit

Edibles, capsules and similar products may report potency as milligrams per unit. A unit could mean:

• One gummy
• One capsule
• One chocolate piece
• One measured serving
• One bottle
• One package

The cannabinoid COA should clearly define the unit. A result of “10 mg/unit” is incomplete if the report does not explain whether the unit is one gummy, one serving or the entire package.

If a package contains 20 gummies with 10 mg CBD per gummy, the theoretical total is:

20 gummies × 10 mg = 200 mg CBD per package

The average amount per unit does not prove that every individual piece contains exactly the same amount. Finished-product testing and product-homogeneity controls are important for confirming consistent distribution.

Micrograms, Parts per Million and Parts per Billion

Lower concentrations may be reported using smaller units.

Micrograms per Gram

One milligram contains 1,000 micrograms:

1 mg/g = 1,000 µg/g

Therefore:

500 µg/g = 0.5 mg/g = 0.05%

Parts per Million

For weight-based results:

1 ppm is generally equivalent to 1 mg/kg or 1 µg/g

Because 1 mg/g equals 1,000 mg/kg:

1 mg/g = 1,000 ppm

Parts per Billion

Parts per billion, or ppb, are normally used for very small concentrations, particularly in contaminant testing.

1 ppb is generally equivalent to 1 µg/kg

Always review the unit carefully. Confusing mg with µg can create a thousand-fold error.

What Does Total CBD Mean?

CBD and CBDA are related but chemically different cannabinoids. CBDA is the acidic precursor of CBD. When heated, CBDA can lose carbon dioxide and convert into CBD through decarboxylation.

For this reason, laboratories may calculate total CBD using:

Total CBD = CBD + (CBDA × 0.877)

The factor of 0.877 accounts for the approximate change in molecular weight during conversion.

Example Total CBD Calculation

Suppose a cannabinoid COA reports:

• CBD: 50 mg/g
• CBDA: 100 mg/g

The calculated total CBD would be:

50 + (100 × 0.877) = 137.7 mg/g

This is equivalent to approximately:

137.7 mg/g ÷ 10 = 13.77% total CBD

Adding CBD and CBDA directly would produce 150 mg/g, which would overestimate the amount of potential CBD after decarboxylation.

What Does Total THC Mean?

THCA is the acidic precursor of delta-9 THC. When heated, part of the THCA can convert into delta-9 THC.

Total THC is commonly calculated using:

Total THC = Delta-9 THC + (THCA × 0.877)

Example Total THC Calculation

If a report shows:

• Delta-9 THC: 1 mg/g
• THCA: 5 mg/g

The calculated total THC is:

1 + (5 × 0.877) = 5.385 mg/g

As a percentage:

5.385 mg/g ÷ 10 = 0.5385% total THC

Measured delta-9 THC and calculated total THC should not be treated as identical values. Which value is relevant may depend on the product, test specification and applicable national rules.

What Does Total Cannabinoids Mean?

“Total cannabinoids” usually refers to the combined amounts of cannabinoids included in a laboratory’s calculation. However, this term is not always standardized.

A laboratory might calculate total cannabinoids by adding:

• Neutral cannabinoids
• Adjusted acidic cannabinoids
• All detected cannabinoids
• Only cannabinoids above the quantification limit
• Only the compounds included in a specific testing panel

For example, a calculation may include total CBD, total THC, CBG, CBC and CBN. Another laboratory may include additional cannabinoids, producing a different total for an otherwise similar sample.

A cannabinoid COA should therefore explain:

• Which cannabinoids were included
• Whether acidic cannabinoids were adjusted
• Whether compounds below the LOQ were included
• Which conversion factors were used
• Whether the total was measured or calculated

Do not assume that “total cannabinoids” means the same thing on every report.

Total Cannabinoids Are Usually Calculated, Not Directly Measured

Individual cannabinoids are normally measured separately through analytical techniques such as high-performance liquid chromatography. The laboratory then calculates a total by combining selected results.

This distinction matters because the total depends on the laboratory’s formula. If two laboratories include different cannabinoids or use different reporting rules, their total cannabinoid values may differ even when the individual measurements are similar.

Readers should focus on the individual cannabinoid results before relying on one combined figure.

Potency by Weight vs Potency by Volume

One of the most common mistakes is comparing a weight-based laboratory result with a volume-based label claim.

For example:

• The COA reports 100 mg/g
• The bottle label reports 1,000 mg per 10 mL

These figures cannot be compared accurately without knowing the liquid’s density and total net weight.

If the liquid has a density of 0.92 g/mL, a 10 mL bottle weighs approximately:

10 mL × 0.92 g/mL = 9.2 g

At 100 mg/g, the estimated amount of the cannabinoid would be:

100 mg/g × 9.2 g = 920 mg

This example shows why assuming that 1 mL always weighs exactly 1 gram can produce inaccurate results.

How to Calculate Cannabinoids in a Whole Container

For a weight-based product:

Cannabinoid concentration in mg/g × total product weight in grams = total milligrams

Example:

• CBD result: 120 mg/g
• Net product weight: 5 g

120 mg/g × 5 g = 600 mg CBD

For a volume-based product:

Cannabinoid concentration in mg/mL × total volume in mL = total milligrams

Example:

• CBD result: 25 mg/mL
• Bottle volume: 30 mL

25 mg/mL × 30 mL = 750 mg CBD

These calculations are only reliable when the product weight or volume is accurate and the laboratory result applies to the complete finished formulation.

Dry-Weight and As-Received Results

Plant materials may be reported on either a dry-weight basis or an as-received basis.

As-Received Basis

This calculation includes the moisture present in the tested sample. It represents the sample in the condition in which it arrived at the laboratory.

Dry-Weight Basis

This calculation mathematically removes the effect of moisture. As a result, the cannabinoid percentage may appear higher than the as-received value.

For example, flower reported as 15% CBD on an as-received basis may show a higher percentage after dry-weight adjustment.

When comparing results from different reports, confirm that both use the same basis. A dry-weight result should not be directly compared with an as-received result without accounting for moisture.

Understanding ND, LOD and LOQ

Potency tables often use abbreviations instead of numerical values.

• ND: Not detected above the test’s detection limit
• LOD: Limit of detection
• LOQ: Limit of quantification
• <LOQ: Below the level that can be reliably quantified
• NT: Not tested
• N/A: Not applicable or not analyzed, depending on the report

A compound marked ND should not automatically be described as completely absent. It means the laboratory did not detect it above the stated LOD.

A result below the LOQ may indicate that a compound was detected, but its concentration was too low to quantify reliably.

Rounding and Measurement Uncertainty

Laboratory results are estimates produced through analytical measurement. Small differences can arise from:

• Sampling variation
• Product homogeneity
• Instrument calibration
• Sample preparation
• Extraction efficiency
• Rounding
• Method uncertainty

For example, a label may state 10% CBD while the laboratory measures 9.7%. Whether that difference is acceptable depends on the product specification, analytical uncertainty and applicable regulatory tolerance.

An exact match should not always be expected, but a large or unexplained difference requires investigation.

5)      How to Read the Terpene Analysis Panel

A terpene analysis panel shows which aromatic compounds were detected in a cannabis or hemp sample and their measured concentrations. When included in a cannabinoid COA, this section can provide useful information about the product’s aroma, formulation, consistency and chemical profile.

However, terpene results require careful interpretation. A long list of compounds does not automatically mean the product has a better aroma or higher quality. Buyers must check the units, detection limits, sample type and total terpene value before comparing results between products.

What Is a Terpene Analysis Panel?

A terpene analysis panel is a laboratory test that identifies and quantifies selected terpenes in a sample. Terpenes are volatile aromatic compounds found in cannabis and many other plants, including citrus fruits, lavender, pine, hops and black pepper.

A terpene panel on a cannabinoid COA may include:

• Myrcene
• Limonene
• Alpha-pinene
• Beta-pinene
• Beta-caryophyllene
• Linalool
• Humulene
• Terpinolene
• Ocimene
• Bisabolol
• Nerolidol
• Camphene
• Valencene
• Guaiol
• Farnesene

The exact number of compounds tested depends on the laboratory and analytical method. Some laboratories test for fewer than 20 terpenes, while expanded panels may include dozens of terpenes and related volatile compounds.

Why Is Terpene Testing Important?

Terpene testing can help manufacturers, retailers and buyers understand the aromatic composition of a product. It may be used to:

• Identify dominant and secondary terpenes
• Compare batches
• Support aroma and flavor descriptions
• Check formulation consistency
• Evaluate terpene-rich extracts
• Confirm whether added terpenes are present
• Monitor changes during storage
• Compare raw materials with finished products

A terpene panel does not prove that a product is safe, effective or legally compliant. It should be reviewed alongside cannabinoid potency, contaminant tests and product documentation.

Check Which Sample Was Tested

Before reviewing individual terpenes, confirm the sample description on the cannabinoid COA. Terpene results can vary considerably between:

• Hemp flower
• Cannabis flower
• Dry sift
• Hash
• Live resin
• Distillate
• Vape liquid
• Terpene blend
• Edible
• Finished formulated product

A report for a bulk terpene blend should not be used as evidence of the terpene content in a finished vape or edible. Likewise, the terpene profile of a raw extract may change after heating, mixing, dilution or storage.

The batch number on the report should match the tested product or ingredient.

Understand the Measurement Units

Terpene results are commonly expressed as:

• Percentage by weight
• Milligrams per gram
• Milligrams per milliliter
• Micrograms per gram
• Parts per million

For weight-based results:

1% = 10 mg/g

Examples include:

Result in mg/g	Approximate percentage
0.1 mg/g	0.01%
0.5 mg/g	0.05%
1 mg/g	0.1%
5 mg/g	0.5%
10 mg/g	1%
20 mg/g	2%

A result of 8 mg/g beta-caryophyllene is equivalent to approximately 0.8% by weight.

Results reported in mg/mL cannot automatically be converted into mg/g without knowing the liquid’s density. Check the basis of measurement before comparing two reports.

What Does Total Terpenes Mean?

Total terpenes generally refers to the sum of the individual terpenes quantified by the laboratory. For example, if the panel reports:

• Myrcene: 0.8%
• Limonene: 0.4%
• Beta-caryophyllene: 0.3%
• Linalool: 0.1%
• Other quantified terpenes: 0.4%

The total terpene value would be approximately:

0.8% + 0.4% + 0.3% + 0.1% + 0.4% = 2.0%

However, total terpene values from different laboratories may not be directly comparable because laboratories may test for different numbers of compounds.

A laboratory testing 50 terpenes could report a higher total than one testing only 20, even if both analyze similar samples. Check which compounds were included before comparing total values.

Dominant and Secondary Terpenes

The terpene with the highest measured concentration is generally described as the dominant terpene. The next most concentrated compounds may be called secondary terpenes.

For example:

The dominant terpene does not act alone. The overall aroma depends on the combination and relative proportions of numerous volatile compounds.

Minor compounds can still influence the perceived aroma, especially when they have low sensory thresholds.

Reading Common Terpenes on a COA

Myrcene

Myrcene is commonly associated with earthy, herbal, musky and sometimes fruity aromas. It frequently appears among the dominant terpenes in cannabis and hemp flower.

Limonene

Limonene is associated with citrus-like aromas, including lemon and orange notes. It is also widely found in citrus peel.

The presence of limonene does not mean the product contains lemon or orange ingredients. Laboratory testing identifies the chemical compound, not necessarily its botanical source.

Alpha-Pinene and Beta-Pinene

Alpha-pinene and beta-pinene are separate compounds commonly associated with pine, resinous, woody and fresh herbal notes.

A cannabinoid COA should ideally report them separately rather than combining them under the general term “pinene.”

Beta-Caryophyllene

Beta-caryophyllene is associated with peppery, spicy and woody characteristics. It is also found in black pepper, cloves and hops.

Linalool

Linalool is often associated with floral, lavender-like and lightly spicy aromas. Even at relatively low concentrations, it may contribute to the product’s overall aromatic character.

Humulene

Humulene is commonly described as earthy, woody and hop-like. It may appear alongside beta-caryophyllene.

Terpinolene

Terpinolene may contribute fresh, herbal, floral, pine-like or citrus-like notes. Its perceived character depends on its concentration and interaction with other volatile compounds.

Ocimene

Ocimene is often associated with sweet, green, herbal and tropical aromatic notes. Laboratories may report different forms of ocimene separately.

Bisabolol

Bisabolol, sometimes listed as alpha-bisabolol, is generally associated with mild floral and herbal characteristics.

Nerolidol

Nerolidol may contribute woody, floral and slightly fruity notes. It can appear in different isomeric forms, which the laboratory may report separately.

Terpene Names and Isomers

Some terpenes can exist as different isomers. These molecules may have similar chemical formulas but different structures or spatial arrangements.

A report may distinguish between:

• Alpha-pinene and beta-pinene
• Cis-ocimene and trans-ocimene
• Cis-nerolidol and trans-nerolidol
• Alpha-farnesene and beta-farnesene
• Different forms of limonene

Check whether the cannabinoid COA reports these compounds separately or groups them together. Two reports may appear different simply because the laboratories use different naming and reporting conventions.

What Do ND, LOD and LOQ Mean?

Terpene panels often contain laboratory abbreviations:

• ND: Not detected above the method’s detection limit
• LOD: Limit of detection
• LOQ: Limit of quantification
• <LOQ: Detected or potentially present but below reliable quantification
• NT: Not tested
• N/A: Not applicable or not analyzed, depending on the report

“Not detected” does not necessarily mean the terpene is completely absent. It means the laboratory did not detect it above the stated detection threshold.

“Not tested” is also different from “not detected.” If a terpene was not included in the analytical panel, no conclusion can be made about whether it is present.

Review the Testing Method

Terpenes are volatile and require suitable analytical methods. Laboratories commonly use gas chromatography, often combined with flame-ionization detection or mass spectrometry.

The report may list methods such as:

• GC-FID
• GC-MS
• Headspace GC
• HS-GC-MS

The selected method should be suitable for the sample type and target compounds. A reliable report should identify the test method or refer to a controlled internal method.

When comparing two reports, recognize that differences in sample preparation, equipment, calibration and analytical scope may affect the results.

Look for Evidence of Added Terpenes

A terpene panel may help identify the composition of a formulated product, but it does not always prove whether the terpenes came directly from cannabis or were added from another source.

Cannabis-derived and botanically derived terpenes can contain the same chemical molecules. Limonene from cannabis and limonene from citrus, for example, may appear as the same analyte on a standard terpene panel.

Determining the source may require:

• Supplier documentation
• Formulation records
• Ingredient declarations
• Traceability documents
• Specialized analytical techniques
• Authenticity or isotope testing

A standard cannabinoid COA should not be used alone to claim that terpenes are cannabis-derived, strain-specific or completely natural.

Compare the COA With the Product Label

The product’s label or specification may state:

• Total terpene percentage
• Dominant terpenes
• Named strain profile
• Natural terpene content
• Cannabis-derived terpenes
• Botanical terpenes
• Added flavoring ingredients

Compare these claims with the laboratory results and supporting documents.

If a label claims a myrcene-dominant profile but the report shows limonene at the highest concentration, request clarification. However, remember that natural batch variation and differences in analytical methods can affect the rankings.

Can a Terpene COA Confirm a Strain?

A terpene panel can show whether a product has a profile broadly associated with a particular cultivar or formulation. However, it usually cannot prove genetic strain identity on its own.

Different cultivars may produce similar terpene patterns, while products sold under the same strain name may vary due to:

• Genetics
• Growing conditions
• Harvest timing
• Drying and curing
• Extraction method
• Storage
• Product age
• Added terpene formulations

Genetic testing, cultivation records and supply-chain traceability may be required to support a specific strain identity.

Terpene Results and Product Freshness

Terpenes can evaporate, oxidize or degrade when exposed to:

• Heat
• Light
• Air
• Moisture
• Poor packaging
• Long storage periods

A fresh sample may therefore have a different terpene profile from the same product after months of storage.

Some terpene loss is expected over time, particularly for highly volatile compounds. A significant difference between batches may indicate changes in raw materials, processing, formulation or storage conditions.

The testing date on the cannabinoid COA should be reviewed alongside the product’s production date and shelf life.

6)      Solvents, Pesticides, Heavy Metals and Microbiology Tests

Cannabinoid potency is only one part of product testing. A product may contain the expected amount of CBD, THC or another cannabinoid while still carrying unwanted chemical or biological contaminants. This is why a comprehensive cannabinoid COA should include relevant safety panels in addition to potency results.

Residual-solvent, pesticide, heavy-metal and microbiological tests examine different types of contamination. Understanding what each panel covers and what it does not cover helps buyers evaluate products more accurately.

Why Are Contaminant Tests Important?

Cannabinoid products can encounter contaminants during cultivation, harvesting, extraction, manufacturing, packaging or storage.

Possible sources include:

• Agricultural chemicals
• Contaminated soil or water
• Extraction solvents
• Processing equipment
• Poor manufacturing hygiene
• Improper drying
• Unsuitable packaging
• Excessive moisture
• Cross-contamination
• Inadequate storage conditions

A cannabinoid COA can provide evidence that a particular sample was tested against defined limits. However, the report must match the product’s batch, and every relevant panel must be reviewed separately.

A potency-only COA does not confirm that the product passed contaminant testing.

Understanding Pass, Fail, ND, LOD and LOQ

Contaminant tables often use abbreviations that must be interpreted correctly:

Term	Meaning
Pass	The result meets the stated specification or action limit
Fail	The result exceeds or does not meet the stated limit
ND	Not detected above the method’s detection threshold
LOD	Lowest concentration the method can detect
LOQ	Lowest concentration the method can quantify reliably
<LOQ	Below the reliable quantification limit
NT	Not tested
N/A	Not applicable or not analyzed, depending on the report

“ND” does not necessarily mean that absolutely none of the substance is present. It means the laboratory did not detect it above the method’s stated limit.

“NT” should never be interpreted as a passing result.

Residual-Solvent Testing

Residual solvents are volatile chemicals that may remain after extraction, purification or other processing steps. They are particularly relevant to cannabinoid extracts, concentrates, distillates, isolates and formulated products.

How Can Solvents Enter a Cannabinoid Product?

Solvents may be used to extract cannabinoids or refine an intermediate material. Examples can include:

• Ethanol
• Butane
• Propane
• Heptane
• Hexane
• Pentane
• Methanol
• Acetone
• Isopropanol
• Ethyl acetate
• Toluene
• Benzene
• Acetonitrile

Not every solvent presents the same risk. Some have more restrictive exposure limits than others. The relevant limits depend on the product category, jurisdiction and applicable testing standard.

How to Read a Residual-Solvent Panel

A residual-solvent section of a cannabinoid COA usually includes:

• Name of each solvent
• Measured concentration
• Unit of measurement
• Action or specification limit
• Pass or fail status
• Analytical method
• LOD and LOQ

Results are often expressed in parts per million, or ppm. For weight-based testing:

1 ppm is generally equivalent to 1 mg/kg

For example, if a report shows:

In this illustrative example, the ethanol result is below the stated limit, but benzene exceeds the stated specification.

Always use the limits printed on the report only after confirming that they correspond to the correct product type and target market.

Why the Testing Method Matters

Residual solvents are commonly analyzed using gas chromatography, often with headspace sampling. The report may refer to methods such as:

• HS-GC-FID
• HS-GC-MS
• GC-FID
• GC-MS

The method should be suitable for the target solvents and product matrix. Testing a thick oil, gummy or vape formulation may require different sample preparation from testing a raw extract.

Residual-Solvent Warning Signs

Potential warning signs include:

• No individual solvents listed
• Only a general “solvents passed” statement
• Missing measurement units
• No action limits
• No testing method
• A panel that excludes solvents used during manufacturing
• A result above the limit marked as passing
• Raw-material testing presented as finished-product testing

Pesticide Testing

Pesticides may be applied during plant cultivation to control insects, fungi, weeds or other agricultural threats. Residues can remain on plant material and may become concentrated during extraction.

A pesticide panel may test for:

• Insecticides
• Fungicides
• Herbicides
• Plant-growth regulators
• Acaricides
• Other agricultural chemicals

The exact compounds included vary between laboratories and regulatory programs.

How to Read a Pesticide Panel

A pesticide section should identify each compound separately. It may include:

• Pesticide name
• Measured result
• LOD
• LOQ
• Action limit
• Pass or fail result
• Analytical method

Results may be reported in:

• ppm
• mg/kg
• µg/kg
• ppb

For weight-based results:

• 1 ppm generally equals 1 mg/kg
• 1 ppb generally equals 1 µg/kg
• 1 ppm equals 1,000 ppb

Carefully check the units before comparing the measured value with the action limit.

Why the Number of Pesticides Tested Matters

A cannabinoid COA may say “pesticide tested,” but that description does not show how many compounds were included.

One laboratory might screen for 20 pesticides, while another tests for several hundred. A passing result only applies to the substances covered by the panel.

Check:

• The complete target-analyte list
• Whether relevant pesticides were included
• The method’s reporting limits
• Whether every compound has a result
• Whether the panel meets the destination market’s requirements

Can “Pesticide-Free” Be Confirmed by a COA?

A laboratory may report that listed pesticides were not detected, but this does not necessarily prove that every possible agricultural chemical is absent.

A more accurate interpretation is:

The tested pesticides were not detected above the method’s stated detection or reporting limits.

Broad “pesticide-free” claims should be supported by an appropriate testing scope and relevant production records.

Heavy-Metal Testing

Cannabis and hemp plants can absorb metals from soil, water, fertilizers and the surrounding environment. Contamination can also come from processing machinery, extraction equipment, pigments or packaging components.

Heavy-metal testing commonly focuses on:

• Lead
• Cadmium
• Arsenic
• Mercury

Some laboratories may include additional elements depending on the product specification or regulatory framework.

How to Read a Heavy-Metal Panel

A heavy-metal table on a cannabinoid COA normally includes:

• Metal name
• Measured concentration
• Permitted or action limit
• Unit
• Pass or fail result
• LOD and LOQ
• Test method

Results may be expressed as:

• mg/kg
• µg/kg
• ppm
• ppb

The measured result must be compared with the limit using the same unit. A result in µg/kg cannot be directly compared with a limit in mg/kg without conversion.

Example Heavy-Metal Results

This is an illustrative example only. Acceptable limits differ by country, product type, route of exposure and applicable standard.

Common Heavy-Metal Testing Methods

Laboratories often use techniques such as:

• ICP-MS
• ICP-OES
• Atomic absorption spectroscopy

The method should be capable of measuring concentrations below the relevant action limits.

Why Product Type Matters

Heavy-metal limits may differ for inhaled, ingested and topical products because the exposure routes are different.

A limit considered appropriate for one product category may not apply to another. Buyers should not rely on a simple “Pass” result without confirming which specification the laboratory used.

Microbiology Testing

Microbiological testing looks for bacteria, yeast, mold and other microorganisms that may affect product safety, stability or quality.

Cannabis and hemp materials can develop microbial contamination during:

• Cultivation
• Harvesting
• Drying
• Trimming
• Extraction
• Manufacturing
• Handling
• Packaging
• Storage

Products with excess moisture or poor storage conditions may be particularly vulnerable to microbial growth.

Common Microbiology Tests

A microbiology panel may include:

• Total aerobic microbial count
• Total yeast and mold count
• Coliforms
• Enterobacteriaceae
• Escherichia coli
• Salmonella
• Staphylococcus aureus
• Pseudomonas aeruginosa
• Bile-tolerant gram-negative bacteria

The required organisms and acceptable limits depend on the product’s intended use and applicable standards.

Quantitative and Qualitative Results

Microbiology results may be reported in two main ways.

Quantitative Results

These report an estimated number of microorganisms, often using:

• CFU/g
• CFU/mL

CFU means colony-forming units.

For example:

Total yeast and mold: 50 CFU/g

This result must be compared with the stated maximum limit.

Qualitative Results

These indicate whether a target organism was detected in a specified sample amount.

Examples include:

• Salmonella: Absent in 25 g
• E. coli: Not detected in 1 g

The amount tested matters. “Absent in 25 g” is not identical to “absent in 1 g.”

Yeast and Mold Testing

Total yeast and mold testing estimates the overall fungal burden in a sample. High counts may suggest problems with:

• Drying
• Moisture control
• Storage
• Packaging
• Manufacturing hygiene
• Raw-material quality

A low total count does not necessarily prove the absence of every harmful fungal species or toxin. Mycotoxin analysis is a separate test.

Pathogen Testing

Pathogen panels target specific microorganisms that may pose a health risk. Common examples include Salmonella and certain strains of E. coli.

A cannabinoid COA should identify:

• The organism tested
• Sample quantity
• Detection method
• Result
• Required specification
• Pass or fail status

A general “microbiology passed” statement without individual results provides limited information.

Microbiology Testing vs Mycotoxin Testing

Microbiology and mycotoxin tests are related but not interchangeable.

Microbiology testing looks for microorganisms or overall microbial counts. Mycotoxin testing looks for toxic compounds produced by certain molds.

Common mycotoxins may include:

• Aflatoxin B1
• Aflatoxin B2
• Aflatoxin G1
• Aflatoxin G2
• Ochratoxin A

A product can potentially pass a total yeast and mold test while still requiring separate mycotoxin analysis. Confirm that both panels are present when they are relevant to the product.

Should Every Product Have the Same Test Panels?

Not necessarily. Testing requirements depend on:

• Product format
• Raw materials
• Extraction process
• Route of exposure
• Intended use
• Manufacturing risks
• Destination country
• Applicable regulatory category
• Supplier and retailer specifications

For example, residual-solvent testing may be especially relevant to solvent-extracted concentrates, while microbiological testing is particularly important for botanical materials and water-containing formulations.

A risk-based testing program should address the realistic contamination routes for each product.

Raw-Material vs Finished-Product Testing

One common mistake is assuming that a raw-material COA proves the quality of the finished product.

A finished product may introduce new risks through:

• Additional ingredients
• Dilution
• Mixing
• Heating
• Filling equipment
• Packaging
• Human handling
• Storage conditions

A supplier might provide a clean COA for cannabinoid distillate, but that report does not automatically confirm that the final vape, gummy or oil is free from contaminants.

The sample description on the cannabinoid COA should clearly state whether the laboratory tested a raw ingredient, intermediate material or finished product.

7)      Common COA Warning Signs and a Practical Checklist

A Certificate of Analysis can provide valuable information about cannabinoid potency, terpene content and possible contaminants. However, not every laboratory report is complete, current or connected to the product being sold.

Learning to recognize warning signs on a cannabinoid COA can help consumers, retailers and wholesale buyers avoid outdated, unrelated or potentially altered documents. A reliable review should cover the laboratory, batch number, testing dates, potency results, contaminant panels and reporting methods.

Why Should You Check a Cannabinoid COA Carefully?

A product may be advertised as laboratory tested even when the available report:

• Covers only cannabinoid potency
• Belongs to a different product
• Relates to an older batch
• Tests a raw ingredient rather than the finished product
• Omits important contaminant panels
• Uses unsuitable specifications
• Cannot be verified with the named laboratory

The phrase “lab tested” does not explain what was tested, which laboratory performed the analysis or whether the product passed appropriate limits.

A complete cannabinoid COA should provide enough information to trace the test results to a clearly identified sample and production batch.

Warning Sign 1: The Batch Number Is Missing

The batch or lot number connects the laboratory results with a specific group of products. If the COA has no batch number, buyers may be unable to confirm that the report belongs to the product in front of them.

Compare the number on the report with the number printed on the:

• Product label
• Container
• Retail packaging
• Wholesale specification
• Delivery paperwork
• Supplier documentation

The numbers should match exactly. A similar product name or stock code is not a substitute for batch-level identification.

Warning Sign 2: The Batch Numbers Do Not Match

A supplier may provide a genuine laboratory report that belongs to a previous or unrelated batch. This can happen accidentally, but it can also conceal differences in potency or contaminant results.

Watch for:

• Missing characters
• Different prefixes or suffixes
• A report covering several unexplained batches
• A sample ID presented as the product batch number
• A product code used instead of a lot number

Ask the supplier to explain any difference and provide documentation connecting the identifiers.

Warning Sign 3: The Laboratory Cannot Be Verified

A legitimate cannabinoid COA should clearly identify the testing laboratory. Check for:

• Full laboratory name
• Physical address
• Website
• Contact information
• Report number
• Accreditation details
• Authorized approval or signature

Search for the laboratory independently instead of relying only on a link supplied by the seller. If the laboratory has a verification portal, enter the report or sample number and compare the retrieved document with the copy provided.

A logo by itself does not confirm authenticity.

Warning Sign 4: The QR Code Leads to the Wrong Place

Many cannabinoid products use QR codes to provide access to laboratory results. Scan the code and check whether it opens:

• The named laboratory’s genuine website
• The correct report
• The correct batch
• A complete and readable document
• Results matching the supplied copy

Be cautious if the QR code leads to:

• A generic homepage
• The retailer’s marketing page
• A different batch
• An editable cloud document
• An expired or inaccessible link
• A report with different results

A QR code is useful only when it links to verifiable information.

Warning Sign 5: The Report Is Old or Undated

A COA should include the dates on which the sample was received, tested and reported. An undated document provides little information about when the analysis occurred.

An older report is not automatically invalid, but it may belong to:

• A previous harvest
• An earlier formulation
• A former ingredient supplier
• A discontinued product
• A different production process

The key question is whether the cannabinoid COA represents the batch currently being supplied.

Warning Sign 6: The Product Description Is Vague

Descriptions such as “hemp sample,” “CBD material” or “cannabinoid product” may not provide enough information to identify what was tested.

A useful description should identify the relevant sample as precisely as possible, including:

• Product type
• Formulation or strength
• Batch number
• Flavor or variant, where relevant
• Raw material or finished product
• Package size, where relevant

A report for bulk distillate does not automatically prove that a finished vape, oil or gummy was tested.

Warning Sign 7: Only Potency Was Tested

A potency panel shows how much CBD, THC or another cannabinoid was measured. It does not confirm the absence of pesticides, residual solvents, heavy metals or microorganisms.

A full-panel cannabinoid COA may include:

• Cannabinoid potency
• Terpene analysis
• Residual solvents
• Pesticides
• Heavy metals
• Microbiology
• Mycotoxins
• Moisture or water activity

The appropriate panels depend on the product and its intended market. Never interpret a potency-only report as complete safety testing.

Warning Sign 8: Important Pages Are Missing

A COA may contain multiple pages, with potency on the first page and contaminant results later in the document.

Confirm that:

• Page numbers are sequential
• The total page count is shown
• Every page has the same sample ID
• All test sections are included
• Footnotes and method information are visible
• No tables appear cropped or covered

If a report says “Page 1 of 6” but only three pages are available, request the complete document.

Warning Sign 9: Results Appear Edited

Potential signs of document alteration include:

• Different fonts within a result table
• Misaligned numbers
• Unusual spacing
• Blurred sections
• Covered or cropped results
• Inconsistent colors
• Missing laboratory headers
• Repeated or misplaced logos
• Values that differ from the laboratory’s online report

Visual inconsistencies do not always prove manipulation because reports may be exported from different systems. Nevertheless, suspicious details should be verified directly with the laboratory.

Warning Sign 10: Units Are Missing or Inconsistent

Potency and contaminant results require clear units. Common examples include:

• Percentage
• mg/g
• mg/mL
• mg/kg
• µg/g
• ppm
• ppb
• CFU/g

A numerical result without a unit cannot be interpreted correctly.

Be cautious when a report compares results using different units without showing the conversion. For example, mg/g should not be treated as equal to mg/mL unless the product’s density supports that calculation.

Warning Sign 11: LOD and LOQ Are Not Shown

The limit of detection and limit of quantification show the sensitivity of the analytical method.

• LOD is the lowest concentration that can be detected.
• LOQ is the lowest concentration that can be quantified reliably.
• ND means the compound was not detected above the stated detection threshold.
• <LOQ means the amount was below reliable quantification.

Without these limits, it may be difficult to understand what “not detected” actually means.

A cannabinoid COA should not present ND as proof that a substance is completely absent.

Warning Sign 12: “Not Tested” Is Treated as “Not Detected”

“NT” and “ND” have very different meanings:

• NT: The laboratory did not test for the substance.
• ND: The laboratory tested for it but did not detect it above the method’s threshold.

If a pesticide, solvent or cannabinoid is marked NT, no conclusion can be made about whether it is present.

Warning Sign 13: The Testing Method Is Missing

A reliable laboratory report should identify the analytical methods used. Common methods may include:

• HPLC for cannabinoid potency
• GC-FID or GC-MS for terpenes and residual solvents
• LC-MS/MS or GC-MS/MS for pesticides
• ICP-MS for heavy metals
• Culture-based or molecular methods for microbiology

The presence of a technical method name does not automatically prove quality, but its absence makes the results harder to evaluate.

Warning Sign 14: Total Values Are Not Explained

A cannabinoid COA may report:

• Total CBD
• Total THC
• Total cannabinoids
• Total terpenes

These values are often calculated rather than measured directly. The laboratory should explain which compounds were included and which formulas were used.

Total CBD is commonly calculated as:

Total CBD = CBD + (CBDA × 0.877)

Total THC is commonly calculated as:

Total THC = Delta-9 THC + (THCA × 0.877)

“Total cannabinoids” may have different definitions between laboratories. A combined value without an explanation should be treated cautiously.

Warning Sign 15: The Label and Laboratory Results Do Not Agree

Compare the COA with the product label. Check:

• Cannabinoid type
• Advertised strength
• Total product content
• Terpene claims
• Batch number
• Product size
• Ingredient description

Small differences may result from normal testing variation, measurement uncertainty or rounding. Large differences require investigation.

For example, a product labelled as containing 2,000 mg CBD should not be supported by a report showing a substantially lower amount without a clear explanation.

Warning Sign 16: Unexpected Cannabinoids Are Present

A report may show cannabinoids that do not appear on the product label. Unexpected THC, delta-8 THC, THCP, HHCP or other compounds may result from:

• Cross-contamination
• Ingredient impurities
• Incomplete processing
• Formulation errors
• Degradation
• Analytical interference
• Incorrect product identification

Unexpected compounds should be discussed with the supplier and laboratory, particularly if they could affect the product’s legal classification or safety profile.

Warning Sign 17: THCP or HHCP Claims Lack Individual Results

If a product is marketed as containing THCP or HHCP, the cannabinoid COA should report those compounds individually.

A general “total cannabinoids” result does not prove the presence or amount of THCP or HHCP. The laboratory should also have appropriate reference standards and a method capable of separating the target compound from related cannabinoids and isomers.

Newer semi-synthetic cannabinoids may require greater scrutiny because analytical methods and commercial reference standards can vary.

Warning Sign 18: Contaminant Limits Are Missing

A contaminant result must be compared with a suitable action or specification limit. A value alone does not show whether the product passed.

Check that the report identifies:

• Measured result
• Action limit
• Unit
• Pass or fail status
• Relevant test method

The limit should be appropriate for the product type, route of use and target market. Limits may differ between countries and product categories.

Warning Sign 19: The Pesticide Panel Is Too Limited

The statement “pesticide tested” does not indicate how many compounds were included. One laboratory may test for a small target list, while another screens for hundreds of substances.

Review the complete list and confirm that:

• Individual pesticides are named
• Results are provided for every analyte
• LOD and LOQ values are suitable
• Action limits are stated
• The panel meets the relevant market requirements

A pass only applies to the pesticides included in the test.

Warning Sign 20: Microbiology and Mycotoxins Are Confused

Microbiology testing may cover bacteria, yeast and mold. Mycotoxin testing looks for toxic substances produced by certain molds, such as aflatoxins and ochratoxin A.

These are separate panels. Passing a yeast-and-mold test does not automatically confirm that the product passed mycotoxin testing.

Warning Sign 21: Raw-Material Testing Is Used for the Finished Product

A clean COA for CBD isolate, distillate or another ingredient does not automatically prove that the final product meets the same specifications.

Contamination or formulation errors can occur during:

• Mixing
• Heating
• Flavoring
• Filling
• Packaging
• Storage
• Transportation

Finished-product testing provides more direct evidence about the product sold to the customer.

Warning Sign 22: The Laboratory’s Accreditation Is Unclear

ISO/IEC 17025 accreditation can indicate that a laboratory has demonstrated competence for specific testing activities. However, accreditation does not necessarily cover every method shown on a report.

Check:

• Accreditation number
• Accreditation body
• Current validity
• Laboratory location
• Scope of accredited testing
• Whether the relevant method is included

An accreditation logo without verifiable details should not be accepted automatically.

Practical Cannabinoid COA Checklist

Use the following checklist before approving or purchasing a cannabinoid product.

Laboratory Verification

• Is the laboratory’s full name shown?
• Can its address and contact information be verified independently?
• Is a report or certificate number provided?
• Does the QR code lead to the correct report?
• Are the accreditation details valid?
• Does the accredited scope cover the relevant testing?

Product and Batch Information

• Does the batch number match the product exactly?
• Is the sample description specific?
• Does the report identify a raw material or finished product?
• Does the product strength or variant match?
• Are all pages connected by the same sample ID?

Dates and Report Status

• Is the sample-received date shown?
• Is the testing date shown?
• Is the report-issue date shown?
• Is the test relevant to the current batch?
• Are any revisions clearly explained?

Cannabinoid Potency

• Are CBD, CBDA, THC and THCA reported separately?
• Are THCP, HHCP or other marketed cannabinoids tested individually?
• Are units clearly stated?
• Are total CBD and total THC calculations explained?
• Does the potency reasonably match the product label?
• Are ND, LOD and LOQ defined?

Terpene Analysis

• Are individual terpenes listed?
• Is the total-terpene value explained?
• Are the units stated?
• Does the reported profile support the label description?
• Are source or strain claims supported by additional evidence?

Contaminant Testing

• Are residual solvents included where relevant?
• Does the pesticide panel show its complete target list?
• Are lead, cadmium, arsenic and mercury tested where required?
• Are microbiological counts and pathogens reported?
• Is mycotoxin testing included separately where relevant?
• Are suitable action limits shown?
• Does every panel have a clear result?

Document Integrity

• Is the report complete?
• Are page numbers sequential?
• Are fonts, tables and identifiers consistent?
• Are any sections cropped or hidden?
• Does the laboratory’s online copy match the supplier’s document?
• Is an authorized signature or approval present?

Market Suitability

• Are the limits appropriate for the product type?
• Are they suitable for the intended route of use?
• Do they correspond to the destination market?
• Has legal compliance been assessed separately from laboratory testing?

8)      Frequently Asked Questions About Cannabinoid COAs

A Certificate of Analysis can help consumers and businesses evaluate the tested composition of a cannabinoid product. However, laboratory reports often contain technical terms, unfamiliar units and multiple testing panels.

The following FAQs explain how to review a cannabinoid COA, verify its connection to a product and understand what the results can and cannot prove.

1. What Is a Cannabinoid COA?

A cannabinoid COA is a Certificate of Analysis issued after a laboratory tests a cannabinoid product or ingredient. It may report cannabinoid potency, terpene concentrations and results for contaminants such as pesticides, heavy metals, residual solvents and microorganisms.

A COA normally applies only to the particular sample submitted for testing. It does not automatically represent every product manufactured by the supplier.

2. Why Is a Cannabinoid COA Important?

A cannabinoid COA allows buyers to compare a product’s laboratory results with its label and specification. It may help confirm:

• CBD, THC or other cannabinoid concentrations
• Batch identity
• Terpene composition
• Residual-solvent results
• Pesticide screening
• Heavy-metal concentrations
• Microbiological results
• Mycotoxin results

The report provides useful quality-control information, but it does not independently guarantee safety, legality or manufacturing quality.

3. Who Produces a Cannabinoid COA?

A laboratory produces the COA after receiving and analyzing a sample. Independent third-party testing can provide greater confidence than relying solely on a manufacturer’s internal results.

A reliable report should identify the laboratory’s name, address, contact information, report number and approval details. Buyers should verify this information through the laboratory’s official website.

4. What Should a Cannabinoid COA Include?

The exact content depends on the sample and testing scope, but a detailed cannabinoid COA may include:

• Laboratory information
• Client or supplier information
• Product description
• Batch or lot number
• Sample ID
• Testing and reporting dates
• Cannabinoid potency
• Terpene analysis
• Residual-solvent testing
• Pesticide testing
• Heavy-metal testing
• Microbiology
• Mycotoxins
• Testing methods
• LOD and LOQ values
• Authorized approval

A report does not need every possible panel in all circumstances, but the testing should be appropriate for the product and its intended use.

5. How Do I Know Whether a COA Matches the Product?

Compare the batch or lot number on the cannabinoid COA with the identifier printed on the product label or packaging. The numbers should match exactly.

Also compare the:

• Product name
• Formulation
• Strength
• Flavor or variant
• Package size
• Sample description
• Manufacturer or supplier

If the report covers a raw ingredient rather than the finished product, it should not be presented as finished-product testing.

6. How Can I Verify That the Laboratory Is Genuine?

Locate the laboratory’s official website independently and compare its details with the report. Check the:

• Laboratory name
• Physical address
• Contact information
• Report number
• Accreditation number
• QR code or verification link

If the laboratory provides an online report portal, enter the report or sample number. You can also contact the laboratory directly to ask whether it issued the document.

7. What Does ISO/IEC 17025 Accreditation Mean?

ISO/IEC 17025 is an international standard relating to the competence of testing and calibration laboratories. Accreditation can indicate that a laboratory has demonstrated suitable procedures, equipment and technical competence for defined testing activities.

However, accreditation does not necessarily cover every test shown on a cannabinoid COA. Check whether the relevant analytical method is included in the laboratory’s accredited scope.

8. What Is the Difference Between a Batch Number and Sample ID?

A batch or lot number identifies a specific production group. A sample ID identifies the particular sample submitted to the laboratory.

A report may also contain:

• Laboratory accession number
• Report number
• Product code
• Purchase-order number
• Customer reference

These identifiers serve different purposes. The batch number on the report should connect clearly with the product being sold.

9. How Recent Should a Cannabinoid COA Be?

There is no single expiry period for every cannabinoid COA. The report should represent the current batch and remain relevant to the product’s formulation, production method and shelf life.

An older report may be unreliable if:

• The formulation changed
• A different ingredient supplier was used
• A new production batch was manufactured
• The product experienced extended storage
• The packaging changed
• The product passed its tested stability period

A recent COA is not useful if its batch number does not match the product.

10. How Are Cannabinoid Potency Results Reported?

Cannabinoid potency may be reported as:

• Percentage by weight
• Milligrams per gram
• Milligrams per milliliter
• Milligrams per unit
• Milligrams per package
• Micrograms per gram
• Parts per million

For weight-based measurements:

1% = 10 mg/g

Therefore, 150 mg/g is equivalent to approximately 15%. Results in mg/mL cannot automatically be converted into mg/g without knowing the liquid’s density.

11. What Do Total CBD and Total THC Mean?

CBD and THC may exist in neutral and acidic forms. CBDA is the acidic precursor of CBD, while THCA is the acidic precursor of delta-9 THC.

Laboratories commonly use these calculations:

Total CBD = CBD + (CBDA × 0.877)

Total THC = Delta-9 THC + (THCA × 0.877)

The factor accounts for the approximate molecular-weight change during decarboxylation. Check the cannabinoid COA because calculation methods and reporting conventions may vary.

12. What Does “Total Cannabinoids” Mean?

Total cannabinoids usually mean the sum of selected cannabinoid results. However, laboratories may include different compounds or use different calculations.

One laboratory might include:

• Total CBD
• Total THC
• CBG
• CBC
• CBN

Another may include a wider panel with minor cannabinoids. The report should explain which results were included and whether acidic cannabinoids were adjusted.

Avoid adding calculated totals to the individual values used to create them, as this would count the same cannabinoid material twice.

13. What Do ND, LOD and LOQ Mean?

These abbreviations describe the sensitivity and reporting limits of the test:

• ND: Not detected above the method’s detection threshold
• LOD: Limit of detection
• LOQ: Limit of quantification
• <LOQ: Below the level that can be reliably quantified
• NT: Not tested
• N/A: Not applicable or not analyzed, depending on the report

ND does not necessarily mean absolute zero. NT also must not be interpreted as a passing or negative result.

14. Can a COA Confirm THCP or HHCP Content?

A cannabinoid COA can support a THCP or HHCP content claim when the laboratory directly tests and reports the target cannabinoid using a suitable analytical method and reference standard.

Check whether:

• THCP or HHCP is listed individually
• The result includes a clear unit
• LOD and LOQ values are shown
• The method can distinguish related compounds
• Isomer reporting is explained
• The laboratory’s testing capability can be verified

A general total-cannabinoid result does not confirm the amount of THCP or HHCP.

Testing these newer cannabinoids may involve greater uncertainty than testing established compounds such as CBD and delta-9 THC.

15. What Does the Terpene Panel Show?

The terpene panel identifies and measures selected aromatic compounds. It may include myrcene, limonene, alpha-pinene, beta-pinene, beta-caryophyllene, linalool, humulene and terpinolene.

The panel can help identify dominant and secondary terpenes and compare batch consistency. However, it usually cannot independently prove:

• Genetic strain identity
• Botanical origin
• Cannabis-derived status
• Product safety
• Legal compliance

A standard terpene panel identifies compounds, but it may not determine whether they came from cannabis or another botanical source.

16. Which Contaminants Should a Cannabinoid COA Cover?

The appropriate tests depend on the product, manufacturing process and intended market. Relevant panels may include:

• Residual solvents
• Pesticides
• Heavy metals
• Bacteria
• Yeast and mold
• Mycotoxins
• Foreign matter
• Moisture or water activity

A solvent-extracted concentrate may require extensive residual-solvent testing, while botanical material may need particular attention to pesticides, microorganisms and mycotoxins.

A potency-only cannabinoid COA does not confirm that contaminant testing was performed.

17. What Does “Pass” Mean on a COA?

“Pass” means the measured result met the particular specification or action limit applied by the laboratory. It does not necessarily mean the product complies with every country’s rules.

Confirm that the specification is appropriate for the:

• Product category
• Intended use
• Route of exposure
• Destination country
• Applicable regulatory framework

A product may pass an internal laboratory specification but fail a different legal or commercial requirement.

18. Does a Passing COA Prove That a Product Is Safe?

No. A passing cannabinoid COA applies only to:

• The sample submitted
• The compounds tested
• The methods used
• The detection limits
• The specifications applied
• The sample’s condition at the time of testing

It does not prove that every possible contaminant is absent or that every item in the batch is identical. Sampling quality, manufacturing controls, storage and product stability also affect overall quality.

19. What Are the Most Common COA Warning Signs?

Common warning signs include:

• Missing or mismatched batch numbers
• No identifiable laboratory
• Unverifiable accreditation
• Missing testing dates
• An outdated report
• Incomplete or cropped pages
• Unexplained measurement units
• Missing LOD and LOQ values
• Altered-looking tables
• Potency-only testing presented as a full safety report
• Raw-material testing used for a finished product
• Missing contaminant limits
• THCP or HHCP claims without individual results
• A QR code linking to a different report
• Label claims that differ significantly from the results

These issues should be clarified before the report is accepted.

20. What Should I Do If a Cannabinoid COA Is Missing or Unclear?

Ask the supplier for a complete, batch-specific cannabinoid COA. If the document remains unclear:

1. Confirm the product and batch numbers.
2. Request all report pages.
3. Check the laboratory independently.
4. Verify the report through its official portal.
5. Ask which methods and action limits were used.
6. Request a finished-product report.
7. Compare the laboratory results with the label.
8. Ask for traceability and manufacturing records.
9. Consider independent testing.
10. Avoid relying on unverified safety or compliance claims.

A transparent supplier should be able to provide an understandable report and explain any differences.