Quality
How to verify a third-party analysis report
· 4 min read
A certificate of analysis is only evidence if it can be traced back to the laboratory that issued it. A PDF forwarded by a supplier proves nothing on its own — it is a file that anyone can edit. This note covers how to check one properly.
Start with the verification key
Independent analytical laboratories issue each report with a unique verification key. Entering that key on the laboratory's own verification page returns the original stored result, independent of whatever document you were sent.
If the returned result matches the report in front of you, the document is genuine. If the key does not resolve, or the returned figures differ, do not accept the document.
Match the batch, not just the compound
Certificates apply to one specific lot. A report for a compound is not evidence about the vial you hold unless the batch number printed on the vial matches the batch named on the report.
Where a supplier can only provide a report for a different lot, treat the material as untested and ask for the matching certificate before use.
Signs a report has been altered
- Fonts, spacing or alignment that change within a single field, particularly on the purity figure.
- A purity or content value that does not match the chromatogram trace shown alongside it.
- Missing sample identifier, analysis date or laboratory contact details.
- A cropped image where the verification key or the laboratory header would sit.
- A report reused across several batch numbers with only the date changed.
Third-party versus in-house testing
In-house results are not worthless, but they are self-reported. An independent laboratory has no commercial interest in the outcome, which is the whole point of third-party analysis.
Where a supplier publishes only in-house data, ask whether independent analysis exists for the lot being quoted.
Keep the evidence with the material
Save the verified report against the lot record at the point of receipt, not later. If a result looks anomalous months into a project, the certificate is the first document you will need and the hardest to reconstruct after the fact.
Frequently asked
What if the verification key does not work?
Treat the report as unverified and raise it with the supplier before using the material. A key that does not resolve either was mistyped, was never issued by that laboratory, or belongs to a document that has been altered.
Should every batch have its own report?
Yes. Analysis is lot-specific, so each released batch should carry its own certificate with a matching batch number and its own verification key.
Research use only. All material referenced is supplied for in-vitro laboratory research by institutions and registered businesses. Not for human or veterinary use, and not for diagnostic or therapeutic purposes.