Why verification matters more than the number on the page
A certificate of analysis can be copied, edited, or presented for a lot it never described. The reported percentage is not what makes a document trustworthy; the ability to confirm the document with its issuer is. Independent testing laboratories therefore assign every report a certificate or report number and keep a record of what that number refers to.
Verification answers one question: does the laboratory that supposedly issued this document confirm that this number belongs to this sample, this lot, and this date?
Step by step
- Find the certificate number. It is usually printed near the top of the report, sometimes labeled "Certificate No.", "Report ID" or "COA ID". Arctic Lab Supply lists it next to each entry in the COA library (for example
COA-2026-Q53ZYU). - Go to the issuing laboratory's verification route. Reputable laboratories publish a verification page or a contact address. Reports published on this site link straight to the testing laboratory's verification page for that certificate.
- Compare four fields. Sample identity, labeled strength, lot identifier, and analysis date on the laboratory's record must match the PDF you hold. A match on the number alone is not enough if the fields differ.
- Compare the result. The reported value and method on the laboratory's record should equal the value and method on the PDF.
- Record the check. Note the date you verified, who verified, and the outcome in the receiving log next to the lot entry.
| Field | On the PDF | On the laboratory record | Outcome |
|---|---|---|---|
| Certificate number | Printed on the report | Found by lookup | Must exist |
| Sample identity and strength | Sample line | Sample line | Must match exactly |
| Lot identifier | Lot line | Lot line | Must match exactly |
| Analysis date | Date field | Date field | Must match |
| Reported result and method | Result line | Result line | Must match |
What a failed verification means
- Number not found: treat the document as unverified. Ask the supplier for the laboratory's direct confirmation before relying on it.
- Number found, fields differ: the document may belong to a different lot or strength. It does not describe the vial in front of you.
- Laboratory has no verification route: the report may still be genuine, but it cannot be independently confirmed. Weigh it accordingly.
Keeping the record useful
File the PDF, the verification screenshot or reference, and the receiving log entry together under the lot identifier. When a later question arises about a specific vial, the lot on its label leads directly to that folder. See matching a vial to its record for the receiving side of this process.