When selecting an analytical laboratory, one of the most important credentials to look for is ISO/IEC 17025 accreditation. While many laboratories advertise various certifications and quality claims, ISO 17025 is the internationally recognized standard that specifically addresses the competence of testing and calibration laboratories. Understanding what it means — and what it does not mean — can help you make a more informed decision about where to send your samples.
What Is ISO/IEC 17025?
ISO/IEC 17025, titled "General requirements for the competence of testing and calibration laboratories," is an international standard published by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). The current version, ISO/IEC 17025:2017, establishes requirements for a laboratory's quality management system, technical competence, and the validity of its results.
The standard covers two main areas:
Management Requirements — These address the laboratory's organizational structure, document control, corrective actions, internal audits, management reviews, and continuous improvement processes. They ensure that the laboratory operates under a controlled, documented quality system.
Technical Requirements — These address the competence of personnel, the validity of methods, the calibration and maintenance of equipment, measurement traceability, sampling procedures, and the handling of test items. They ensure that the laboratory can actually produce accurate and reliable results.
How ISO 17025 Differs from ISO 9001
A common source of confusion is the difference between ISO 17025 and ISO 9001. While both are quality management standards, they serve fundamentally different purposes:
ISO 9001 is a general quality management standard applicable to any organization. It focuses on whether an organization has processes in place and follows them consistently. However, it does not assess whether those processes produce technically valid results. A laboratory can be ISO 9001 certified and still produce inaccurate data if its methods are not properly validated or its instruments are not properly calibrated.
ISO 17025 includes all the management system requirements of ISO 9001 but adds a critical layer of technical competence assessment. An ISO 17025 accredited laboratory has demonstrated — through rigorous third-party assessment — that its methods produce accurate results, its personnel are competent to perform the work, and its equipment is properly calibrated and maintained.
In practical terms: ISO 9001 asks "Do you have a process?" while ISO 17025 asks "Do you have a process, and does it produce correct results?"
The Accreditation Process
ISO 17025 accreditation is not self-declared. It requires assessment by an independent accreditation body — in the United States, typically A2LA (American Association for Laboratory Accreditation), ANAB, or PJLA. The process involves:
1. Document Review — The accreditation body reviews the laboratory's quality manual, procedures, and records to verify compliance with the standard. 2. On-Site Assessment — Trained assessors visit the laboratory to observe operations, interview personnel, review records, and witness testing activities. 3. Proficiency Testing — The laboratory must participate in proficiency testing programs where it analyzes blind samples and its results are compared against reference values and other laboratories. 4. Scope Definition — Accreditation is granted for specific test methods and matrices, not as a blanket credential. The laboratory's scope of accreditation lists exactly which tests it has been assessed for. 5. Surveillance — Accreditation is not a one-time event. Accredited laboratories undergo periodic surveillance assessments (typically annually) and full reassessments (typically every two to four years).
Why It Matters for Your Products
Choosing an ISO 17025 accredited laboratory provides several tangible benefits:
Regulatory acceptance — Many regulatory agencies, including the FDA, recognize ISO 17025 accreditation as evidence of laboratory competence. Test results from accredited laboratories are more likely to be accepted without additional scrutiny.
Data defensibility — If your test results are ever challenged — by a regulatory agency, a customer, or in litigation — results from an accredited laboratory carry significantly more weight than results from a non-accredited facility.
Reduced risk — Accreditation provides independent verification that the laboratory's methods are validated, its instruments are calibrated, and its personnel are trained. This reduces the risk of receiving inaccurate results that could lead to product recalls, regulatory actions, or patient harm.
International recognition — ISO 17025 is recognized worldwide through mutual recognition agreements between accreditation bodies. Results from an accredited laboratory in the United States are generally accepted by regulatory authorities in Europe, Asia, and other regions.
ILS Laboratories' Accreditation
ILS Laboratories maintains ISO 17025 accreditation for our analytical testing services. Our scope of accreditation covers the specific methods we use for chemical analysis, microbiology, and related testing — meaning that an independent accreditation body has verified our competence for each test we offer.
We view accreditation not as a marketing credential but as a fundamental commitment to producing results you can trust. Every Certificate of Analysis we issue is backed by validated methods, calibrated instruments, competent analysts, and a quality system that is independently audited on a regular basis.