Beyond “Lab-Tested”: What a Cannabis Certificate of Analysis Can—and Cannot—Tell You

A cannabis certificate of analysis can help explain what a laboratory found in a sample. Yet opening one often creates more questions than answers.

What does “ND” mean? Does a passing result mean a product contains no contaminants? Why does the report show several dates and identification numbers?

These questions matter because a testing report contains more detail than a “lab-tested” statement on a package. Reading that detail requires context, especially when a document includes unfamiliar terms or covers only certain tests.

For adults in Port Huron and across Michigan, understanding these reports is a useful form of consumer literacy. The goal is to know what the document supports, what remains unclear, and where to direct questions.

What Is a Cannabis Certificate of Analysis?

A certificate of analysis, often called a COA, records laboratory results for an identified sample. Depending on the testing performed, it may include cannabinoid measurements, contaminant results, methods, and reporting limits.

Michigan’s Cannabis Regulatory Agency publishes sampling and testing guidance for laboratories within its regulatory system. That framework provides context for testing, but readers still need to examine the scope of the individual report.

Think of a COA as a record of specific analytical work. A report does not automatically establish every aspect of product quality, explain an ingredient list, or predict a person’s response.

A useful reading order is:

1. Confirm which product and sample the report describes.

2. Identify the laboratory and report version.

3. Check which tests appear.

4. Read the results alongside their units and limits.

5. Note any questions the document leaves unanswered.

Starting with identification helps prevent a common mistake: studying detailed results from a report that does not clearly relate to the package in front of you.

Start With the Product Details

Before looking at percentages, compare the report with the package label.

Look for the product name, manufacturer, product type, and available batch or package identifiers. A matching brand name alone does not establish that a document covers a particular item.

For example, a report for one batch cannot automatically describe every batch sold under the same product name.

Some identifiers may serve different roles. A laboratory sample number identifies the material within the laboratory’s records. Other numbers may refer to a production batch or an inventory package.

Michigan’s sampling rules distinguish between batches, collected test samples, and records in the statewide monitoring system. These are related records rather than interchangeable labels.

If the identifiers differ, ask how they connect. Avoid assuming that a mismatch proves misconduct, but do not guess that two documents belong together.

A precise question helps:

“Which information connects this report to the package I have?”

That gives the business a clear issue to investigate.

Check Who Issued the Report

Next, find the laboratory’s name and any listed license information.

A polished layout, official-looking seal, or familiar logo cannot establish authenticity by itself. Those elements may help identify a document, but they do not replace verification.

Michigan provides license-verification resources through the Cannabis Regulatory Agency. Use the appropriate state search when checking a laboratory or other regulated business.

For questions about a report’s authenticity, find the laboratory’s contact details independently. Explain which report you are asking about and provide its identification number.

Also distinguish the roles of the businesses involved. The manufacturer makes the product, the laboratory performs the listed analysis, and the retailer handles the retail transaction. A question about an analytical method may require the laboratory’s explanation.

Read the Dates and Report Status

A report may contain several dates, each describing a different event.

These can include sample collection, laboratory receipt, analysis, and report issuance. A package may separately show manufacturing or packaging dates.

Read the labels beside each date instead of treating every date as the testing date.

Also look for wording such as “final,” “amended,” or “revised.” If multiple versions appear, ask which version applies and what changed.

An amendment does not automatically signal a problem. However, unexplained differences between copies deserve clarification.

Keep these practical checks in mind:

• Does the document identify its issue date?

• Are all pages present?

• Does another version appear to replace it?

• Can the issuing laboratory explain any revision?

These checks help establish which document you are reading before you interpret its numbers.

Separate Cannabinoid Results From Contaminant Results

Cannabinoid measurements and contaminant testing answer different questions.

A cannabinoid panel measures compounds such as THC or CBD. Other panels may assess specified pesticides, metals, microbial impurities, mycotoxins, or residual solvents. Laboratories offer distinct analyses for these different categories.

Seeing a THC result does not establish that the same page contains contaminant testing.

Likewise, a detailed terpene profile does not fill the role of a pesticide panel. The number of compounds listed can make a report look comprehensive while leaving its actual scope unclear.

Read the panel headings and the individual substances tested. If someone describes a document as a “full report,” ask what that means for the specific product and testing purpose.

A missing panel is a question to resolve. It should not become an assumed passing result—or an automatic accusation of noncompliance.

Understand the Units Before Comparing Numbers

A number without a unit tells only part of the story.

Reports may express results as percentages, milligrams per gram, milligrams per unit, or other measures. Contaminant tables may use much smaller concentration units.

For concentration by mass, 1% equals 10 milligrams per gram. That conversion does not make every figure on a report directly comparable.

For instance, a concentration measurement and a total amount in an entire package describe different things.

Before comparing two results, ask:

• Do they measure the same compound?

• Do they use the same units?

• Do they describe concentration or a total amount?

• Do they refer to comparable product types?

• Are they measured or calculated values?

This is a document-reading exercise, not a method for choosing a dose. A COA cannot determine an appropriate amount for an individual.

What Do LOD, LOQ, and ND Mean?

Some of the most useful information appears in small abbreviations beside the results.

NIST describes detection limits in terms of reliably distinguishing and identifying a substance. Its quantitation terminology adds the ability to measure with acceptable precision and bias.

Always check the report’s own legend. Laboratories may use different reporting conventions, and a general definition cannot resolve every notation.

If “ND” appears without an obvious explanation, ask which threshold the laboratory used. That question is more informative than asking whether the result means “completely clean.”

Why “Pass” Does Not Mean “Nothing Was Present”

A pass/fail field summarizes a result against an applicable criterion.

That criterion is different from a detection limit. One concerns whether a result meets a requirement; the other concerns what the analytical method can detect.

Consequently, “passed,” “not detected,” and “zero” are not interchangeable statements.

Read the individual result, its unit, and the relevant limit together. A large “PASS” heading should not replace those details.

For example, imagine a hypothetical report that lists a measured concentration below a stated action limit. The laboratory may report a passing result even though it measured a nonzero amount.

The interpretation depends on the actual test and criterion. Ask the laboratory to explain unclear fields rather than applying this example to an unfamiliar report.

What the Report Cannot Predict About You

Laboratory measurements cannot tell you exactly how cannabis will affect a particular person.

The CDC explains that effects depend on several factors, including THC concentration, previous experience, biology, route of use, and use alongside other substances.

A report therefore cannot establish:

• Whether someone will experience an unwanted reaction.

• Whether a product suits a particular medical condition.

• Whether it may interact with a person’s medicines.

• Whether someone can drive safely.

• Whether an ingredient presents an allergy concern.

Those questions require information beyond the listed analytical results.

Keep ingredient and allergen information separate from laboratory interpretation. For personal medical questions, consult a qualified healthcare professional rather than relying on a passing test result.

What to Do When a QR Code Does Not Answer Your Question

A QR code may open a specific report, a brand website, or a general information page. Its presence does not tell you which destination you will reach.

After scanning, check whether the page identifies the relevant product and report. If it opens a generic page, look for a report search or contact route.

For an unresolved label question about an item obtained from JARS, the business lists its local contact information through JARS Cannabis’s Port Huron contact details. That page provides a contact route; it should not be mistaken for a laboratory-report database.

When asking for clarification, include the product name, visible identifiers, and the exact issue. For example:

“The QR code opens a general page. How can I identify the report associated with this package?”

Avoid posting receipts or personal details publicly while seeking help.

Keep a Small Record of Unresolved Questions

If you need clarification, save the complete report rather than a cropped image of its headline result.

Photograph the relevant label and note where you found the document. This makes it easier to explain a discrepancy without relying on memory.

A short checklist can help:

• Product and manufacturer identified.

• Relationship to the package explained.

• Laboratory and report number visible.

• Dates and version checked.

• Relevant panels located.

• Units and abbreviations understood.

• Remaining questions written down.

You do not need to become a laboratory expert. You need enough context to recognize when a document answers your question and when someone must explain more.

Read the Evidence Behind the Label

“Lab-tested” is a starting point. The useful detail lies in the report’s identity, scope, methods, and results.

A careful reader checks which sample the document covers, separates different kinds of testing, and avoids treating a passing result as a personal safety guarantee.

When information does not line up, a specific question is more useful than a confident guess. That habit makes technical documents easier to understand—and keeps their conclusions within what the evidence can support.