Laboratory & Inspection Practice
ISO/IEC 17025 essentials for testing laboratories
Core expectations of ISO/IEC 17025 with a focus on technical competence and reliability of results.
Why this matters
Credible accreditation depends on consistent methods, clear decisions, and evidence that stands up to independent review. This publication translates essential expectations into practical steps so teams can prepare, communicate, and operate with confidence.
Key requirements and expectations
- Link technical competence to methods, equipment, and personnel.
- Demonstrate control of critical technical activities.
- Show traceability, uncertainty, and data integrity.
- Maintain records that prove repeatability and validity.
- Method validation and measurement uncertainty are central.
- Technical records must be complete, legible, and traceable.
- Personnel competence must match the methods in scope.
Evidence and records to prepare
- Method validation or verification records and approvals.
- Calibration certificates and equipment maintenance logs.
- Training and authorization records for technical staff.
- Proficiency testing results and follow-up actions.
- Signed test reports with traceability references.
Common pitfalls to avoid
- Using unvalidated methods or undocumented deviations.
- Incomplete measurement uncertainty or traceability chains.
- Missing training records for authorized signatories.
- Sampling or chain-of-custody steps not controlled.
- Using methods outside validated ranges or conditions.
Practical checklist
- Confirm methods are validated or verified for intended use.
- Maintain up-to-date equipment and calibration schedules.
- Document staff competence and authorization limits.
- Review PT and QA results before external assessment.
- Confirm each method has a current validation record.