Certificate of Analysis (COA)
A certificate of analysis (COA) is a batch-specific document that records test results and methods for one production lot, normally against stated acceptance criteria. Its contents depend on the agreed material specification. Buyers use it to connect a supplied lot with identity, quality attributes and release decisions relevant to their qualification process.
Why does Certificate of Analysis (COA) matter when sourcing?
The COA is the primary link between a commercial lot and its reported test results. It helps a buyer decide whether the offered lot meets the agreed specification and which additional evidence is needed. Without matching product and lot identifiers, a polished document or attractive result cannot be reliably connected to the material being shipped.
What should you verify about Certificate of Analysis (COA)?
Check the product name, lot number, test dates, methods, units, results, limits and issuing laboratory or signatory. Match those identifiers to the quotation, labels and shipment. Request chromatograms, identity data or safety documents where required, and resolve missing or illegible fields before acceptance rather than assuming a standard field list applies.
What can Certificate of Analysis (COA) not tell you?
A COA does not independently prove that the document is authentic, that the sample represented the whole lot or that the material suits every use. A template from another lot is not current-lot evidence. Qualification may also require source verification, audit records and review of the underlying analytical data.
Related terms
Category: quality · Part of our peptide glossary · Sourcing question? Ask our engineers for a qualified project review.