Key takeaway
A COA is useful only when its sample, batch, methods, units and results are understood in context.
A certificate of analysis, or COA, records results for a tested sample. It can help document attributes of a cannabis batch, but interpreting it begins with confirming what was actually tested.
Start with the sample identity
Look for the laboratory name, report date, sample or lot identifier, and product description. Compare those details with the specific package or production records. A report from a different lot should not be presented as that product's test result.
Read the cannabinoid results carefully
Reports can distinguish THC, THCA, CBD and CBDA, with results expressed in specific units. Total or potential cannabinoid figures may involve conversions; do not treat every number as interchangeable. Use the result definitions stated on the report.
Check the scope of testing
Depending on the sample and jurisdiction, a COA may cover cannabinoid content, terpene composition, microbiological testing or other analyses. A section absent from a report is not evidence that it was tested and passed.
Understand method and detection limits
Testing methods, measurement uncertainty and reporting thresholds affect interpretation. A result described as not detected is not necessarily proof of absolute absence; consult the laboratory's stated detection or quantification limit.
What a COA cannot establish
A laboratory report represents the tested sample and scope of the analysis. It cannot guarantee a particular personal experience, freshness at every future date or identical results for every batch.
Further reading
Read Reading the Paper Trail and Same Cultivar, Different Batch.
This article is intended for legal-age audiences in markets where cannabis is permitted. It is for general education only, not medical advice. Product details, availability, and packaging can vary by province, retailer, and batch.