Most manufacturers know they should use ISO 17025-accredited laboratories. Far fewer understand what that accreditation actually guarantees — and what it doesn’t. That gap leads to real problems: relying on accredited labs for tests that fall outside their accredited scope, assuming accreditation means regulatory compliance, or choosing labs based on the presence of an accreditation logo without verifying the underlying scope.
ISO/IEC 17025:2017 is the international standard for the competence of testing and calibration laboratories. Understanding what it requires — and what it leaves to individual lab discretion — is essential for any manufacturer building a serious testing program.
The 2017 revision of ISO/IEC 17025 reorganized the standard around a risk-based approach, moving away from the more prescriptive structure of the 2005 version. The current standard covers five main areas: general requirements (impartiality and confidentiality), structural requirements (legal identity, organizational structure), resource requirements (personnel, equipment, facilities), process requirements (method selection, validation, sampling, handling), and management system requirements (documentation, internal audits, management review).
The resource and process sections are where manufacturers should focus their attention. Under clause 6 (Resources), the standard requires that personnel performing testing activities be competent — meaning they have the education, training, and demonstrated technical skill for the specific tests they conduct. Equipment must be calibrated, maintained, and traceable to national measurement standards. Facilities must be appropriate for the testing being performed.
Under clause 7 (Process), the standard requires that laboratories use validated methods. For methods published in recognized standards — USP, AOAC, ASTM, ISO test methods — the lab must verify that they can perform the method correctly in their specific environment. For in-house methods or methods not covered by published standards, full method validation is required. This distinction matters: a lab running a published USP method still needs to demonstrate they can execute it correctly, but the validation burden is lower than for a proprietary method.
ISO 17025 accreditation is a statement that a laboratory has demonstrated competence for specific tests on specific matrices, as defined in their accreditation scope. It is not a blanket endorsement of everything the lab does.
A lab can be ISO 17025-accredited and still run tests outside their accredited scope. This happens routinely — a client requests a test the lab can perform but hasn’t sought accreditation for, and the lab runs it as a non-accredited service. The Certificate of Analysis may look identical whether the test was accredited or not. The difference is in the fine print: accredited COAs should reference the accreditation body and certificate number, and the specific tests should be listed in the lab’s current scope document.
Accreditation also doesn’t mean the lab is compliant with FDA GMP requirements. ISO 17025 and FDA 21 CFR Part 111 (for dietary supplements) or 21 CFR Part 117 (for food) have overlapping but distinct requirements. A lab can be ISO 17025-accredited without having the documentation practices, batch record systems, or personnel training records that FDA GMP compliance requires. For manufacturers in FDA-regulated industries, both sets of requirements matter.
The only reliable way to verify a lab’s accreditation status is to check directly with the accreditation body. In the United States, the major bodies are:
Each of these bodies maintains a public directory of accredited laboratories with their current scope documents. Download the scope document and confirm it covers the specific tests, methods, and matrices you need. Scope documents list tests by method reference (e.g., “USP <232> Elemental Impurities — Procedures”) and often specify the matrices covered (e.g., “dietary supplements, solid dosage forms”).
If a test you need isn’t listed in the scope, ask the lab directly whether it’s offered as a non-accredited service. That’s not necessarily a problem — some specialized tests aren’t covered by any accreditation scheme — but you should know the difference and document it in your supplier qualification records.
Manufacturers sometimes confuse ISO 17025 and ISO 9001. ISO 9001 is a quality management system standard — it addresses how an organization manages its processes, documentation, and continuous improvement. ISO 17025 is a technical competence standard — it addresses whether a laboratory can actually perform specific tests correctly.
A manufacturing facility might hold ISO 9001 certification. That tells you their quality management processes meet a defined standard. It says nothing about whether their in-house testing is technically sound. For third-party testing laboratories, ISO 17025 is the relevant standard. For a manufacturer’s internal quality management system, ISO 9001 may be more directly applicable — though many manufacturers in regulated industries operate under FDA GMP frameworks that effectively supersede ISO 9001 requirements.
When building a lab supplier qualification program, accreditation status and scope should be documented and reviewed annually. Labs are re-assessed by their accreditation bodies on a regular cycle — typically annually for surveillance and every few years for full reassessment — but scope can change between assessments. A lab can add or remove tests from their scope, and those changes may not be communicated proactively to clients.
Build an annual review into your supplier qualification SOP: download the current scope document, compare it to the previous version, and confirm that all tests you rely on are still within the accredited scope. This takes 20 minutes per lab per year and has prevented more than a few compliance problems for the manufacturers we work with at Aurora TIC.
Requirements vary by product category and regulatory context. Consult a qualified regulatory expert to confirm the specific accreditation requirements that apply to your products and markets.