Methodology · 2 July 2026
Reading a Certificate of Analysis
A short guide to interpreting purity, measured content, and lot identifiers on an independent COA.
A certificate of analysis is a laboratory document describing what was measured in a specific batch of material. The three fields research users refer to most often are the reported purity, the measured peptide content, and the lot or batch identifier.
Purity is reported as a percentage of the target compound within the analysed sample. Measured content describes the mass of the target compound found in the vial. The lot identifier links the certificate to a physical batch and is the reference used to trace a product back to its production run.
When Sequence Club publishes a supporting document, it is linked from the relevant product page. If a report is pending or unavailable, the product page states that status directly. Interpret any result only within the methods and limits stated in the report.
