Peptide Report Guide · September 12, 2026
How to read a research-material COA
Start with the analytical question, then determine whether the document answers it.
Identify the sample
Record the material label, sample or lot identifier, report date and named laboratory. Check that the product option you are comparing uses the same identity and amount—or record the difference.
Separate the questions
| Question | What to look for |
|---|---|
| Identity | The stated analytical method, expected and observed result, and how the report identifies the sample. |
| Purity | The method, reported percentage and what the percentage represents. Do not assume a chromatographic area percentage is vial quantity. |
| Quantity | A relevant quantitative result and units. A label amount and measured amount are different fields. |
| Other testing | Only the tests actually documented. Do not infer sterility or every impurity assessment from a single result. |
Read limitations
A report describes the sample and tests it identifies. It is not automatically proof about every package, future lot or different size. It is not clinical approval or a recommendation for human use.
Keep the original
Open the full image from the source directory. Record the URL and date, and ask the supplier about anything missing from the sample-to-product relationship.
Further PEL documentation: COA reading guide and HPLC and mass spectrometry.