01Make an identifier map

WHO's model certificate distinguishes the sample and batch information from the laboratory's report details. This is a useful way to organise your check: one set of fields describes the material; another tells you which document records the testing.WHO certificate model (opens in a new tab)

These strings are not interchangeable. An enquiry quoting only DMAS3J7 could identify the laboratory task, but a vial labelled PEP-41-3J7 is making a lot claim. Record both exactly, including letters, digits and separators; do not shorten them to the familiar compound name.

02Compare the physical item and the selected size

Write down the name, labelled amount and lot from the vial or its associated packaging. Then select that vial size on the product page and open the full certificate. The size selector matters because another size may point to a different report. Keep the PDF open while comparing, rather than relying on a cropped product-page summary.

A 10 mg certificate does not directly document a 20 mg fill simply because the compound name matches. Likewise, a report for a single peptide is not the report for a blend that contains that peptide. Treat a difference in formulation or named components as a material difference that needs an explanation.

03Resolve mismatches without guessing

If the vial uses a supplier lot code and the report uses a laboratory sample code, ask for the documented relationship between them. There may be a legitimate mapping, but similar-looking endings are not evidence of it. A useful response identifies both codes and states which supplied material the tested sample represents.

If the name and size match but the lot differs, keep the certificate as a document for the lot it actually names. Do not silently relabel your record. If the lot is absent or unreadable on the item, record that gap and request help identifying it. Missing information is different from a confirmed mismatch.

A revised report also deserves a check. Confirm which revision applies, what changed and whether it supersedes the copy you downloaded. Retain the earlier copy in your records if it informed a previous decision; replace the active reference only when the relationship is clear.

04Keep a compact matching record

• ✓Item: name, labelled size and the lot visible on the supplied material.
• ✓Document: full filename, report identifier, task reference and revision.
• ✓Comparison: matched fields, missing fields and any differences.
• ✓Resolution: the supplier's explanation or mapping, with the date received.

For example, write “Semax 10 mg; vial lot not yet confirmed; PDF names PEP-41-3J7” if that is all you know. That is more useful than marking the item “COA checked”, because someone reading the record later can see exactly which part of the connection remains open.

05Keep matching separate from authentication

Matching establishes whether the document describes the claimed material. It does not prove that the laboratory issued it or that the stated results are correct. If provenance matters to your work, verification of the issuer and report is an additional task. Even a perfect identifier match cannot fill in a test that the report never performed.