Certificate of analysis: A certificate of analysis is a laboratory document that reports test results for a given sample or batch. In cannabis, it may include cannabinoid content and other quality or contaminant testing information.
Patients frequently encounter COAs when trying to understand product labels or batch changes.
More common in private-market and product-information contexts than NHS patient pages.
COA format varies, and a COA is not a substitute for prescribing advice or proof that a product is suitable for a specific patient.