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ISO/IEC 17025 for calibration users

The clauses of ISO/IEC 17025 that shape what an accredited laboratory can and must give you — traceability, uncertainty, reporting and scope.

10 articles · about 31 min · for Customers of accredited laboratories and staff preparing an in-house laboratory for accreditation.

  1. 01ISO/IEC 17025ISO/IEC 17025 calibration explainedWhat accreditation to ISO/IEC 17025 does and does not tell you about a calibration.4 min
  2. 02ISO/IEC 17025ISO/IEC 17025:2017 structure: what each clause coversThe 2017 edition is organised into general, structural, resource, process and management-system requirements. Knowing the map makes the standard usable.3 min
  3. 03MetrologyMetrological traceability under ISO/IEC 17025An unbroken, documented chain of calibrations back to the SI, each with its own stated uncertainty. What ISO/IEC 17025 actually requires you to show.3 min
  4. 04ISO/IEC 17025Metrological traceability in ISO/IEC 17025 (clause 6.5)Results must be traceable to the SI through a competent laboratory's calibration, the certified value of a reference material, or direct realisation.3 min
  5. 05Laboratory DiscoveryAccreditation bodies and the ILAC MRANational accreditation bodies assess laboratories to ISO/IEC 17025; the ILAC Mutual Recognition Arrangement makes those certificates equivalent worldwide.3 min
  6. 06Laboratory DiscoveryHow to read a scope of accreditationA scope lists, per quantity, the range, the calibration and measurement capability and the method — so it says what a laboratory can certify, and how well.3 min
  7. 07ISO/IEC 17025Equipment requirements in ISO/IEC 17025 (clause 6.4)Equipment must be fit for purpose, calibrated where it affects results, checked, protected from adjustment, and fully recorded — including software.3 min
  8. 08ISO/IEC 17025Evaluation of measurement uncertainty (clause 7.6)Laboratories must identify the contributions to uncertainty and, for calibration, evaluate the uncertainty of every result — their own equipment included.3 min
  9. 09ISO/IEC 17025Reporting results and statements of conformity (clause 7.8)A certificate must carry defined identification, method, traceability and uncertainty information — and any pass/fail statement must name the decision rule.3 min
  10. 10ISO/IEC 17025Nonconforming work under ISO/IEC 17025 (clause 7.10)An out-of-tolerance reference, a failed data-quality check or a wrong method must be controlled, evaluated for impact on results issued, and recorded.3 min

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