Quality · 6 min read
How to read a research-material certificate of analysis
A practical framework for checking identity, lot matching, methods, dates, and the limits of a COA.
Published 2026-07-25. Educational research-operations content only.
Start with traceability
A certificate is useful only when it can be tied to the material in hand. Compare the product name, lot or batch identifier, reported quantity, test date, and laboratory information with the label and order record.
A polished PDF without a matching lot identifier is not a substitute for traceability.
Separate identity from purity
Identity testing asks whether the material matches the expected compound. Purity testing estimates how much of the measured sample is represented by the main component under the stated method. Those are related but different questions.
- Look for the analytical method and the result, not only a large purity percentage.
- Check whether the report identifies the sample and batch clearly.
- Confirm the testing laboratory and report date are visible.
- Treat a COA as one part of quality review, not a guarantee of every property.
Ask what is not shown
A report may not address sterility, endotoxins, residual solvents, fill accuracy, storage history, or contamination unless those tests are explicitly listed. Do not infer unreported results.
Field Lab provides available lot documentation on request and does not represent a document as covering tests that are not shown.