Illustrated hemp laboratory report with chromatogram, sample vial, and magnifying glass

How to Read a Hemp Certificate of Analysis

July 12, 2026 at 5:22 pm

A hemp certificate of analysis, usually called a COA, is a laboratory report for an identified sample. It can show which compounds or contaminants a laboratory tested for, which methods it used, what it measured, and how the result compares with a stated limit.

The most important word in that description is identified. A COA is useful only when you can connect it to the product, batch, lot, or sample it describes. It is not a blanket certificate for every product with the same name, every batch a company has sold, or every type of testing a laboratory could perform.

Read a COA in this order:

Match the product and sample identity.
Check the dates.
Identify the test panels that were actually performed.
Read the units and result qualifiers.
Review methods, limits, notes, and signatures.
Keep the report’s scope in mind.

Start with identity, not the biggest number

Laboratory reports often place cannabinoid percentages or a pass/fail box where they are easy to notice. Before reading those results, find the identifying information near the top of the report.

Look for:

product or sample name;
batch, lot, or production identifier;
laboratory sample ID;
client or company name;
sample type or matrix, such as plant material, oil, concentrate, or edible;
sample amount, when reported;
collection or receipt date;
test and report dates.

The product name alone is rarely enough. Names can be reused across harvests or production runs. A laboratory sample ID identifies the laboratory’s record, while a batch or lot number is meant to connect the sample to a defined group of material. If the product label and report use different identifiers, the seller should be able to explain the connection.

Some product galleries contain several COA images. Do not assume they are consecutive pages from one report merely because they appear together. Compare the laboratory name, sample ID, product name, dates, and page numbering on every image. Separate potency and contaminant reports may have been produced by different laboratories or from separately submitted samples.

Check when the sample was handled and reported

A COA may include several dates:

Collected or sampled: when the test portion was taken.
Received: when the laboratory accepted it.
Tested or analyzed: when the measurement was performed.
Reported or issued: when the laboratory released the result.

These dates answer different questions. A recent upload date on a storefront does not make an older laboratory result new. Likewise, the report date does not reveal when the current unit was packaged unless the report or product record provides that connection.

When dates are missing or far apart, that is a reason to ask for context—not automatic proof that the result is invalid. The practical question is whether the report can still be matched to the material being offered.

Find out which panels were actually tested

“Lab tested” does not identify a test. A laboratory may analyze cannabinoids without testing pesticides, metals, microbes, mycotoxins, or residual solvents. A report can be complete for the work ordered while still answering only one part of a buyer’s question.

Common panels include:

Panel	What it examines	Important limit
Cannabinoid profile or potency	Reported amounts of named cannabinoids	It does not establish that contaminants were tested
Pesticides	Listed pesticide analytes	The list and action limits depend on the method or regulatory program
Heavy metals	Metals such as lead, arsenic, cadmium, or mercury when included	A cannabinoid result says nothing about metals
Microbial impurities	Named organisms or microbial measures	A pass applies to the organisms and limits shown
Mycotoxins	Toxins produced by certain molds	This is distinct from a general microbial panel
Residual solvents	Solvents named in the panel	Most relevant to products made with extraction or processing steps, but scope varies
Moisture or water activity	Water-related measurements in a sample	These measurements are not interchangeable and should be read as labeled
Terpenes	Reported amounts of named terpenes	A terpene panel does not establish effects or product quality by itself

California’s Department of Cannabis Control, for example, lists cannabinoids, terpenes, residual solvents, pesticides, heavy metals, microbial impurities, mycotoxins, moisture or water activity, and foreign material among the required categories in its regulated cannabis program. That is a useful example of a defined panel system, but it should not be treated as a universal checklist for every hemp product or jurisdiction. The applicable program, product type, and purpose matter.

If a panel is absent, the accurate conclusion is usually not shown on this report. It is not “passed,” and it is not necessarily “failed.”

How to read a cannabinoid table

A cannabinoid table normally lists each analyte on its own row. Common entries include CBD, CBDA, delta-9 THC, THCA, CBG, CBGA, CBC, CBN, and others. The table may report results in percent by weight, milligrams per gram, milligrams per milliliter, or another unit appropriate to the sample.

Percent by weight and milligrams per gram

For a mass-based result:

1% by weight equals 10 milligrams per gram.
0.3% by weight equals 3 milligrams per gram.
10% by weight equals 100 milligrams per gram.

That conversion does not automatically tell you the amount in a bottle, gummy, capsule, or serving. To calculate a package amount, you also need the relevant total mass or volume, product density where necessary, and a clear statement that the tested sample represents that finished product.

Acidic and neutral cannabinoids

Cannabis plants can contain acidic cannabinoids such as CBDA and THCA as well as neutral cannabinoids such as CBD and delta-9 THC. Some reports display both the measured values and calculated totals.

A commonly used calculation for total THC is:

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

The factor accounts for the difference in molecular mass when THCA is converted to THC. A report may use its own displayed precision and rounding. Read the laboratory’s formula and notes before trying to reproduce the total.

USDA’s domestic hemp production program requires compliance testing to account for total THC on a dry-weight basis using post-decarboxylation or another similarly reliable method. That program concerns representative samples collected from hemp production lots. It should not be confused automatically with every finished-product COA displayed at retail.

“ND,” “<LOD,” and “<LOQ” do not all mean zero

Laboratory tables use qualifiers to explain results near the lower end of a method’s measuring range. The report legend controls the exact meaning, but common terms include:

ND: not detected under the stated method and reporting conditions;
LOD: limit of detection, the level at which the method can distinguish a signal from background with the laboratory’s stated criteria;
LOQ: limit of quantitation, the level at which the laboratory can report a numeric amount with its stated performance;
<LOQ: the analyte may have been observed below the laboratory’s quantitation limit, or the result is below the level the method reports numerically, depending on the legend;
NR: not reported, when defined that way by the laboratory.

None of these expressions means mathematical proof that a substance is absolutely absent. They describe what the method could detect or quantify in that sample under the reported conditions.

This distinction matters when a product or label uses phrases such as “THC-free.” The first questions should be: Which THC analytes were tested? What were the detection and quantitation limits? Which sample and batch were tested? What does the report legend say?

A pass or fail needs a named limit

Contaminant reports often place “Pass” or “Fail” beside each analyte. Read across the entire row:

analyte name;
result;
unit;
detection or quantitation limit;
action or specification limit;
status.

A pass means the reported result met the named program or specification shown on that report. It does not mean the product was tested for every possible substance, that every future batch will match, or that the laboratory made a clinical safety determination.

If a report says only “Pass” without showing the analytes, units, limits, or a reference to the governing specification, it provides less information than a result table with those details.

Methods, accreditation, and quality controls

The method section may identify an instrument or procedure, such as high-performance liquid chromatography, gas chromatography, mass spectrometry, or a published method reference. It may also list the sample-preparation procedure and a method identifier used by the laboratory.

Method details matter because cannabinoids occur in different chemical forms and product matrices behave differently during preparation and analysis. A method suitable for dried plant material may require different validation for an oil, gummy, or concentrate.

Accreditation to ISO/IEC 17025 can show that a laboratory’s management system and technical activities were assessed for a defined scope. The scope is important: accreditation is not a universal endorsement of every test a laboratory offers, nor does it make an individual result immune from sampling, preparation, instrument, calculation, or reporting problems.

Reference materials and interlaboratory comparisons help laboratories evaluate measurement performance. NIST created hemp reference material RM 8210 with assigned values and uncertainty estimates for cannabinoids and toxic elements. NIST’s Cannabis Laboratory Quality Assurance Program also compared results across participating laboratories. These tools are valuable precisely because measurement quality requires continuing checks; a report should not be treated as unquestionable merely because it looks official.

Measurement uncertainty and rounding

Every measurement has uncertainty. On some reports, especially production-compliance reports, a result may appear with a plus-or-minus value or confidence interval.

USDA requires laboratories in its hemp production program to calculate and report measurement uncertainty for total THC results. The uncertainty describes the dispersion of values that could reasonably be attributed to the measurement under the stated method. It is not the same as saying that the laboratory guessed, and it is not a guarantee that the true value lies at a single exact point.

Rounding also matters near a legal or specification threshold. Do not infer an unrounded result from a rounded display. Use the laboratory’s reported value, uncertainty, significant figures, and applicable rule together.

The sample sets the boundary of the result

A laboratory analyzes the material it receives. The value of the result depends on how that material was selected, collected, stored, prepared, and connected to a batch.

USDA’s production program uses trained sampling agents and procedures intended to produce a representative composite sample from a hemp lot. Finished-product and voluntary retail testing may use different sampling rules. A seller-submitted sample is not automatically equivalent to an independently collected regulatory sample.

That does not make voluntary testing useless. It means the report should be described accurately: a result for an identified sample, collected and submitted under the conditions shown.

A practical COA checklist

Before relying on a report, ask:

Does the product name match?
Is there a batch, lot, or sample identifier that connects the report to the product?
Who collected and submitted the sample?
When was it received, tested, and reported?
What is the sample type or matrix?
Which panels appear, and which do not?
What units are used?
What do ND, LOD, LOQ, and other qualifiers mean on this report?
Are action or specification limits shown for pass/fail results?
Is the method identified?
Is the laboratory’s accreditation scope or license relevant to the test?
Do separate pages share the same lab, sample ID, dates, and page numbering?
Are there amendments, comments, or disclaimers that change how the result should be read?

If the identity or scope is unclear, ask for the original report or a better batch-to-product match. A clear answer is more useful than assuming that a gallery image covers tests it does not show.

For a focused overview of report matching, panels, dates, units, and reporting limits, use the Lab Documentation Center.

Finding COAs on Industrial Hemp Farms

Current IHF product pages place available COA images in the product gallery. The Lemon Octane CBD Flower page, for example, includes cannabinoid and separate contaminant-report images. Check each image’s laboratory, identifiers, dates, and panel rather than assuming every image belongs to a single report.

You can also browse the current CBD Flower, THCA Flower, CBD Oils, Concentrates & Isolates, CBD Pre-Rolls, and Edibles collections. Product availability and documents can change, so use the current product page as the starting point.

Sources and review date

Last fact-checked: July 12, 2026
Next review: January 2027, or sooner if IHF changes its COA presentation or a cited testing standard materially changes.

Written By : Industrial Hemp Farms Editorial Desk