What to Do When a Certificate Won't Resolve on the Lab's Portal

Short answer: a certificate that will not resolve usually has a boring explanation, and the useful skill is telling the boring ones from the one that matters. Work through them in order before concluding anything.

Five reasons, in the order worth checking

1. You are looking up the wrong number. Certificates carry several: a batch or lot code, an accession or report number, and sometimes an internal sample reference. Portals almost always want the accession number, which is frequently the least prominent of the three. Check which field the lookup is actually asking for.

2. The portal only holds recent work. Some laboratories expire lookups after a period — a year or two is common — and older reports stop resolving even though they were genuine when issued. An old certificate that no longer resolves is weaker evidence, but it is not evidence of fabrication.

3. The report was never in that portal. A laboratory can issue a PDF without publishing it to a public lookup, particularly for private client work. The document can be entirely real and simply not indexed anywhere you can reach.

4. The portal is broken or blocking you. Verification portals go down, and several block automated traffic in ways that also catch ordinary browsers behind a VPN. A failed automated check is not a finding. We hold ourselves to this: a portal that refuses a scripted request gets opened in a real browser before anything is concluded.

5. The certificate does not correspond to anything. This is the one that matters, and it is the last thing to conclude, not the first.

How to separate them

Try a certificate you have good reason to think is genuine — ideally from a different vendor using the same laboratory. If that one resolves and yours does not, the portal works and the problem is specific to your document. If neither resolves, the problem is the portal or your access to it.

Then invent a number and look that up. If the portal returns a certificate for a number you made up, stop: the lookup is decorative and nothing it returns means anything, including the result that looked fine.

What to ask the seller

Ask for the accession number and the laboratory's own name, in writing. Both are ordinary requests that a seller with a real testing relationship can answer immediately.

How that request is handled tells you more than the answer does. A vendor that supplies both in a sentence has a relationship it can describe. A vendor that redirects to a marketing page, or explains why the information cannot be shared, has told you something without meaning to.

What this changes about a rating

Nothing here moves a vendor's rating on its own. A resolvable certificate is rated where it belongs — on whether reports resolve on a laboratory's domain at all — and one document that will not resolve is a prompt to check the pattern, not a verdict.

Related: how to check a testing laboratory actually exists · COA purity vs identity · reading a vendor batch history.

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General educational information, not claims about any specific company. For research and educational purposes only. Not medical advice. Some links on this site are affiliate links.