A signature can indicate responsibility for a laboratory report, but its meaning depends on the role, document and signing process. A printed name, a scanned handwritten mark and a cryptographic digital signature do not provide the same evidence. None replaces the analytical information needed to interpret the result.
Read the role next to the name
NIST’s reporting crosswalk identifies review and authorisation before issue, and identification of the person authorising the report, as reporting elements. The role should be understood from the document rather than inferred from a name alone.NIST — Reporting-results crosswalk (opens in a new tab)
| Field | Question to ask |
|---|---|
| Analysed by | Who performed the recorded work? |
| Reviewed by | What review responsibility does the document identify? |
| Authorised by | Who approved release of this report? |
| Issued on | When was this version released? |
These labels are illustrative, not mandatory wording for every laboratory. One person may have more than one role where the applicable system permits it. The reader should not invent a second reviewer merely because a signature is present.
A professional title is also not a full account of qualifications or authority. If that information matters to the assessment, request the laboratory’s explanation of the role.
Distinguish an image from a verifiable signature
SGS’s document-verification guidance distinguishes cryptographic digital signatures from scanned handwritten signatures or simple visual sign-off. Its description concerns protection of report authenticity and integrity.SGS — Document-verification FAQ (opens in a new tab)
A screenshot of a signature shows a visible mark. It does not contain the original PDF’s cryptographic evidence. A printed “digitally signed” label is likewise a statement to check, not the validation itself.
Adobe’s official guidance describes checking digital-signature validation details, the signer’s certificate and its trust relationship. It also distinguishes a time from the signer’s computer from a timestamp-server record.Adobe — Validate digital signatures (opens in a new tab)
Understand what successful validation does not prove
A valid digital signature can support the integrity of signed content and its relationship to a signer. It does not independently repeat the laboratory experiment or establish that the sample represented every unit in a batch.
In an original scenario, a laboratory correctly signs a report for sample S-100. A seller then links that unchanged report to a different product. The signature can remain valid while the product-to-report connection is wrong.
Similarly, a signed report may contain a disclosed limitation or a result outside specification. The signature does not convert an unfavourable finding into approval; it helps establish responsibility for the finding actually stated.
Do not describe a laboratory signature as scientific peer review of a supplier’s article. Report authorisation and independent review of a research interpretation are different activities.
Resolve missing or uncertain sign-off information
If a copy lacks an authorisation page, request the complete report before concluding that no approval occurred. If the document is explicitly marked draft, keep that status visible rather than treating the presence of a name as final release.
If software reports an unverified signature, preserve the message and ask the issuer how to validate the original file. Do not alter trust settings solely to obtain a reassuring indicator without establishing the signer’s identity.
A concise record should identify the file version, the visible authorisation role and any digital-validation result. This keeps a documentary observation separate from claims about personnel, laboratory competence or product suitability.
Sources and further detail
- NIST — Reporting-results crosswalk (opens in a new tab)
Review, authorisation and authorising-person fields in the official 2018 crosswalk.
- SGS — Document-verification FAQ (opens in a new tab)
Question 3 checked for distinction between cryptographic signatures and visible signature images. No legal-effect claim reproduced.
- Adobe — Validate digital signatures (opens in a new tab)
Official documentation checked for certificate trust, validation details and timestamp distinctions. No instruction to bypass validation.
Sources checked 19 September 2026. Worked examples are illustrative unless a supplied report is explicitly identified. This article has not undergone independent scientific peer review.