A Certificate of Analysis should do more than display a large purity number. It should connect a specific material and batch to the reported analytical work.
Start with identity
Check the product name, strength or format, SKU, and batch or lot reference. The document is most useful when those fields clearly correspond to the material being reviewed.
Then review the method
Look for the analytical method and the reported result together. HPLC is commonly used to characterize purity, but the method, sample, and report context matter.
Keep batch specificity in mind
A COA is not a permanent universal statement about every future batch. Use the document connected to the material and batch you are evaluating.
Do not over-read a purity number
Purity information does not by itself establish human safety, sterility, therapeutic effectiveness, or suitability for an unapproved use. Research materials remain research materials.
Freedom quality resources
Use the quality standard and Lab Reports & COAs for product-documentation context.