How to read a peptide certificate of analysis

Identify the document and the sample

Find the issuing laboratory, report ID, test date, sample description and batch or lot identifier. Check whether the supplier listing and the supplied material refer to that same lot. A report about another sample cannot establish a match.

Ask which questions were tested

Separate identity, chromatographic purity and quantity. Look for the method, result, units and any acceptance criteria for each question. Do not replace a missing measurement with a marketing statement or assume that every possible impurity was measured.

Find the supporting analytical records

Where supplied, review the chromatogram, mass spectrum and explanatory notes with the appropriate laboratory expertise. If a plot, method or unit is missing, ask the issuing laboratory to clarify it rather than inferring a result.

Verify the record at its source

Navigate to the laboratory independently and use its published report-check route, where available. Compare the report identifier and sample details. Even an authentic record describes its stated sample and testing scope; it is not a certificate of medical suitability.

Your report-reading checklist

Mark the questions you have addressed Issuing laboratory and report ID recorded Sample and batch identifiers compared Test methods and units understood Scope and limitations read Issuer verification route checked

0 of 5 documentation questions addressed. This is a reading aid, not a product-safety assessment.

Sources & further reading

Sources consulted 31 October 2026. This is a general documentation guide, without qualified clinical or regulatory review. See the research disclaimer.

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