What does a laboratory’s accreditation scope show, and why should a buyer check it?

Main answer · Wecent Editorial Team

Short answer: An accreditation certificate is not a blanket approval. It comes with a scope that lists the specific tests, standards and ranges the lab is accredited for, at a named site. Check that the tests in your report appear in the current scope, that the accreditation was active on the test date and that the report refers to the accreditation.

What accreditation means

ISO/IEC 17025 is the international standard for the competence of testing and calibration laboratories. An accreditation body assesses a lab against it and grants accreditation for a defined scope. Well-known bodies include A2LA and NVLAP in the United States and the Standards Council of Canada in Canada.

Why the scope is the key

Accreditation applies to specific activities, not the whole lab. The scope lists the test methods, standards, product types and ranges the lab can perform under accreditation. A lab can be accredited for one test and not for another, and for one site and not a second.

What to check

1. Lab name and site. The accreditation must cover the location that did the work.
2. Status and dates. Check that accreditation was valid on the date of the test.
3. Tests and standards. Find the standard or test in your report in the scope, with the right edition where listed.
4. Report marking. Reports that claim accreditation usually show the accreditation body’s logo or a statement, and sometimes mark non-accredited items.
5. Signatory status. Many accreditation bodies take part in international recognition arrangements, which helps reports be accepted abroad. Ask your certifier whether it matters for your market.

How to verify

• Search the accreditation body’s public directory by lab name or certificate number.
• Download or request the current scope document.
• Compare the scope with the list of tests in your report.
• Ask the lab directly if something is unclear.

What to do if a test is outside scope

The test may still be valid for certain purposes, but a buyer or authority may not accept it. Ask your certifier whether it will accept the report, or repeat the test at a lab with the right scope.

Red flags

• An accreditation logo with no certificate number.
• A scope that lists other tests but not yours.
• A lab that is hard to find in any directory.
• A report issued after the accreditation expired.

Keep it with the report

Save the scope document next to the test report in your compliance file.

Sources checked on 24 Oct 2026: A2LA: Frequently asked questions; ILAC: Guideline for describing scopes of accreditation.

Where this answer says to confirm with Wecent, the detail is not published on the product page and has to come from the datasheet or the factory. General facts come from the regulators, standards bodies or device makers named in the text.