Certificates of analysis
How to read a peptide certificate of analysis
Separate purity, identity, quantity, and microbiological evidence before accepting a research lot.
7 min read · Research guide
Topic / Certificates of analysis
Peptide certificate of analysis (COA): how to read and check one
Start here for peptide COAs: how to read one, decode its abbreviations, find a supplier's lot certificate and handle a lot number that does not match.
If you are new to peptide certificates, read the COA walkthrough first and keep the abbreviations glossary open beside it. Together they explain what each section of a typical certificate is for and which lines tie it to a specific lot.
Then move from reading to checking. Locate the certificate that belongs to your lot, compare the lot number, quantity and date against the vial label, and record the result. If the lot number does not match, follow the mismatch guide before anyone uses or rejects the material, and keep the correspondence with the supplier.
For detail on individual test results such as HPLC, mass spectrometry, water content or endotoxin, continue to the certificate interpretation guides.
Guides and explainers
Certificates of analysis
Peptide COA abbreviations: HPLC, MS, LAL, KF, TFA and more
A plain-language glossary of the abbreviations found on peptide certificates of analysis, what each test or term shows, and what to check next to it, with links to the deeper guides on this site.
8 min read · Research guide
Certificates of analysis
OMNI Peptides COA library: how to find a lot certificate and check it against your vial
What OMNI Peptides' COA library page shows to a visitor on 30 October 2026, what OMNI says about certificates in its own policies, and a step-by-step check to match a certificate to the lot on your vial and confirm the issuing laboratory.
7 min read · Research guide
Certificates of analysis
COA lot number does not match the vial: what to do before using or rejecting the lot
A step-by-step fix for a certificate whose lot or batch number differs from the vial label: photograph, check formats, quarantine, request the lot-specific certificate within the supplier's window, and log the outcome.
7 min read · Research guide
Certificates of analysis
Certificate of conformance vs certificate of analysis vs spec sheet: what each document proves
What a certificate of analysis, certificate of conformance, specification or technical data sheet, safety data sheet and statement of origin each prove, which are lot-specific and contain results, how suppliers substitute one for another, and what to ask for instead.
8 min read · Research guide
Certificates of analysis
Method validation terms on a COA: specificity, LOD, LOQ, linearity and 'validated method' claims
A plain-language glossary of ICH Q2(R2) validation terms, the numbers the guideline uses for detection and quantitation limits, linearity and precision, what 'validated', 'qualified' or silence means on a certificate, and the questions to ask a testing laboratory.
9 min read · Research guide