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How to Read Cannabis Labels and Lab Reports: 8 Questions Answered
· BUDDHA BROS
Watch: Labels and lab reports
18-second narrated summary with on-screen text.
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- Milligrams describe amounts. Percentages describe proportions.
- Check whether a number is per serving or per package.
- A laboratory report must match the product batch.
Animated editorial illustrations and general information. See the article below for context and sources.
Flower, concentrates and edibles can present cannabinoid information in different ways. This Q&A explains the measurements and documents, without assuming that an individual product has been verified.
What is a cannabis certificate of analysis (COA)?
A COA records laboratory results for a tested batch. It is different from a product description or a claim that something is lab-tested. California requires batch testing that includes cannabinoid content and contaminant checks. Read the report as evidence about the sample tested, not a description of every product sharing a name.
Why should the batch number match the report?
A product name can be reused across different batches. The report must correspond to the batch being described; a report for another batch does not establish its results. California labels include batch or lot information. If the identifiers are missing or inconsistent, the connection between the label and report has not been demonstrated.
What is the difference between THC and total THC?
Delta-9 THC and THCA may appear as separate entries. THCA can convert to THC when heated. Total THC accounts for THC already present and the potential contribution from THCA. A low delta-9 THC entry alone can therefore give an incomplete impression of intoxication potential. Total THC still does not predict an individual response.
Are percentages and milligrams the same measurement?
No. A percentage describes a proportion, while milligrams describe an amount. A concentration and a package total answer different questions. Check the units and what is being measured before comparing numbers. California manufactured-product labels distinguish cannabinoid amounts per package from per-serving amounts where applicable; flower and infused pre-roll labeling can use different formats.
Does a serving amount describe the whole package?
Not necessarily. One package can contain multiple labeled servings. A per-serving figure should not be read as the package total. Read both entries and the stated serving count. These are label definitions, not a recommendation about how much to use.
What does a passing lab result actually mean?
In California, a COA reports whether the batch passes or fails the required tests. Testing can include pesticides, residual solvents, heavy metals, microbial impurities and other categories. Passing does not establish a medical benefit or eliminate the risks of cannabis itself. A potency-only panel is not the same as a complete contaminant report.
What do ND and LOQ mean?
ND generally means not detected under the test method. LOQ means limit of quantitation: the threshold at which an amount can be reliably quantified. An entry below LOQ should not be treated as a precisely measured zero. Read the laboratory legend and units because reporting conventions matter. California regulations explicitly distinguish these reporting terms.
Can the label tell you exactly how cannabis will affect you?
No. Effects depend on factors including concentration, route of exposure, previous experience, frequency and other substances. Edible effects may be delayed, and labels can be inaccurate. A number on a package is not a personal safety assessment. Health questions and possible medication interactions belong with a qualified clinician.