| Publisher | ISO and IEC |
|---|---|
| Type | Standard (international conformity assessment standard) |
| Scope | General requirements for the competence, impartiality and consistent operation of laboratories that perform testing, calibration or sampling. |
| Who uses it | Calibration and testing laboratories, metrology and quality managers, accreditation bodies, instrumentation teams and organizations that rely on test and calibration certificates. |
| Edition note | The 2017 edition (ISO/IEC 17025:2017) is the current edition at the time of writing; refer to ISO for any later revision. |
What It Is
ISO/IEC 17025 is the international standard that defines what it means for a testing or calibration laboratory to be competent. It is jointly published by ISO and IEC and is used worldwide as the basis for laboratory accreditation. Laboratories in industry, government, research and commercial service use it to demonstrate that they operate competently and generate valid results.
The 2017 edition is organized into general requirements (impartiality and confidentiality), structural requirements, resource requirements (personnel, facilities and environmental conditions, equipment, metrological traceability and externally provided products and services), process requirements (from review of requests and method selection through measurement uncertainty, reporting and handling complaints) and management system requirements. It adopts a risk-based approach and gives laboratories the option of meeting management system requirements directly or through an ISO 9001-conforming system.
Why It Matters
Engineering decisions depend on measurements. Calibrated instruments, factory acceptance tests, cable tests, relay tests and safety function proof tests all assume that the underlying measurements are reliable. Accreditation to ISO/IEC 17025 provides independent assurance that a laboratory's results are traceable and technically valid.
Through the ILAC Mutual Recognition Arrangement, results from accredited laboratories are widely accepted across borders, which reduces retesting and supports trade. In the United States, accreditation bodies such as A2LA and ANAB accredit laboratories to the standard, and many customers and regulators require accredited calibration. Accreditation is always granted for a defined scope. A laboratory may be accredited for some measurements, ranges and uncertainties but not others, so users of calibration and test certificates should check that the specific work performed falls within the laboratory's accredited scope before relying on the result.
Key Concepts
- Impartiality — the laboratory must identify and manage risks to objective judgment, including commercial and financial pressures.
- Personnel competence — requirements for defining, evaluating and monitoring the competence of staff who influence results.
- Metrological traceability — an unbroken, documented chain of calibrations linking results to national or international measurement standards.
- Measurement uncertainty — laboratories must evaluate uncertainty, and calibration labs must report it, so results can be interpreted correctly.
- Method validation — confirmation that methods, especially non-standard or modified ones, are fit for their intended use.
- Decision rules — the stated way that measurement uncertainty is accounted for when declaring conformity with a specification.
- Ensuring validity of results — activities such as proficiency testing, interlaboratory comparisons and control checks.
- Management system options — laboratories may meet management system requirements directly within the standard or through a system that conforms to ISO 9001.
Who Should Know It
- Calibration technicians and metrologists
- Laboratory and quality managers
- Instrumentation engineers responsible for calibration programs
- Test engineers in factory and field testing services
- Auditors and assessors of laboratories and suppliers
Related Standards
- ISO/IEC 17020 — the conformity assessment standard for inspection bodies, the inspection counterpart to ISO/IEC 17025.
- ISO 9001 — the quality management system standard, aligned with but distinct from laboratory competence requirements.
- ISO 10012 — requirements for measurement management systems within organizations.
- IEC 61508 — functional safety work relies on valid test and calibration results.
How ASEEE Uses It
ASEEE instrumentation, calibration and quality programs map learning outcomes and assessments to ISO/IEC 17025 concepts, including traceability, uncertainty, competence and validity of results. See related ASEEE programs.
ASEEE Programs Referencing This Standard
- Field Instrument Communication and Pressure Calibration
- Instrumentation and Control for Calibration and Inspection
- Instrumentation and Electrical Calibration Technician
Educational summary only. ASEEE is not the publisher of this document and this page does not reproduce or replace it. Always consult the current official edition from ISO and IEC for requirements.