A certificate of analysis (COA) is a claim about a sample, presented as a document. Like any document, it can be accurate, outdated, misattributed, edited, or fabricated, and a reader looking at an image on a product page usually cannot tell which. COA verification is the step that connects the document back to the laboratory that supposedly issued it.
This article explains why verification matters, how to approach it, and what a successful verification does and does not establish.
Why a COA Needs Verifying
COAs are typically shared as PDFs or images. These formats are easy to copy and edit, and nothing about a document’s appearance guarantees its origin. Several problems can occur, some deliberate and some not:
- Reuse: a genuine report for one batch is presented for a different batch or product.
- Alteration: values, dates, lot numbers, or compound names are changed on a genuine report.
- Fabrication: a report is created from scratch using a real or invented laboratory’s name.
- Misattribution: a report is attributed to a better-known laboratory than the one that performed the work.
- Clerical mismatch: an honest error links the wrong report to a listing.
Verification cannot detect every problem, but it is the most direct way to confirm that a laboratory actually issued a given report with the stated results.
What Verification Means
At its simplest, verification is confirmation from the issuing laboratory that a specific report is authentic and unaltered. That confirmation should come through a channel the laboratory controls, not one supplied by the party presenting the report.
This distinction matters. A link, QR code, or email address printed on a COA could itself be part of an altered document. Verification is more reliable when you locate the laboratory independently first.
How to Approach COA Verification
Step 1: Identify the laboratory independently
Note the laboratory name on the report, then find the laboratory’s official website through a search engine or an accreditation directory rather than through links on the COA or the vendor’s site. Check that the address and contact information match.
Step 2: Check for an official verification tool
Some laboratories offer an online lookup where a report number or access code retrieves the original record. If one exists, reach it from the laboratory’s own website. Compare every field: sample name, lot number, dates, methods, and results.
Step 3: Contact the laboratory if needed
Where no lookup exists, laboratories may confirm whether a report number is genuine. Policies vary, and some will not discuss client results with third parties. A short, specific request is most likely to receive a response. For example:
- The report or certificate number.
- The date of the report.
- The sample name and any lot number shown.
- A question asking whether the laboratory issued this report and whether the attached copy matches its records.
If a laboratory declines to confirm details for confidentiality reasons, record the report as unverified rather than as either genuine or false.
Step 4: Check accreditation, and its scope
Many testing laboratories are accredited to ISO/IEC 17025, the international standard for the competence of testing and calibration laboratories. Accreditation is granted by accreditation bodies, such as A2LA in the United States, many of which are signatories to the ILAC Mutual Recognition Arrangement.
Two details are easy to miss:
- Accreditation is method-specific. It applies to the tests listed on the laboratory’s scope of accreditation, not to everything the laboratory does. A laboratory accredited for one test may perform others outside its accredited scope.
- Accreditation status changes. Check the accreditation body’s directory for a current certificate and scope, rather than relying on a logo printed on the report.
ISO/IEC 17025 accreditation indicates that a laboratory has been assessed as competent to perform specific methods. It does not mean every report is correct, and it says nothing about the product beyond the sample tested.
Step 5: Check internal consistency
Even before contacting anyone, a careful read can reveal issues. Do the dates follow a logical order? Does the peak table match the summary purity? Is the observed mass consistent with the compound named? Do fonts, alignment, or formatting change partway through the document? Our guide on reading third-party lab results covers these checks in more detail.
What Verification Establishes
A successful verification is meaningful. It supports the conclusions that:
- The named laboratory issued the report.
- The report’s contents match the laboratory’s records.
- The listed results were obtained for the sample the laboratory received.
What Verification Does Not Establish
Verification confirms the document. It does not extend the document’s scope.
- It does not show the sample was representative. If the vendor chose and submitted the sample, verification does not tell you whether it reflects what customers receive.
- It does not link the report to your unit. Unless the lot number on the report matches the lot number on the product, the connection is not established.
- It does not expand the tests performed. A verified purity report is still only a purity report. It does not address identity, quantity, endotoxin, or sterility unless those tests were run.
- It does not make the report independent. A verified report commissioned by a vendor remains vendor-supplied documentation.
This is why Amino Review describes verification status separately from who commissioned the testing. Our review methodology explains how these categories are labeled in our coverage.
Key Takeaways
- A COA’s appearance does not establish its authenticity; verification connects it to the issuing laboratory.
- Locate the laboratory independently rather than relying on contact details printed on the report.
- ISO/IEC 17025 accreditation is method-specific; check the current scope with the accreditation body.
- A report the laboratory will not confirm should be recorded as unverified, not assumed genuine or false.
- Verification confirms a document, not that the sample was representative or that other tests were performed.
Disclaimer: This article is educational and does not assess any specific laboratory, report, or vendor. It is not legal, medical, or purchasing advice.