Recital 5

(5) Technical operations to ensure the quality and comparability of analytical results should follow quality management system practices accepted at international level. For that purpose, the practices set out in EN ISO/IEC-17025 are appropriate. It is appropriate to ensure that laboratories performing chemical analysis demonstrate their competence through the participation in internationally or nationally recognised proficiency testing programmes and through the use of available reference materials. In view of harmonising practices at the Community level, the organisation of proficiency testing programmes should be based on relevant international standards. To that end, ISO/IEC guide 43-1 on proficiency testing by interlaboratory comparisons — Part 1: Development and operation of proficiency testing schemes provides an appropriate guide. The results of those programmes should be evaluated on the basis of the internationally recognised scoring systems. In this regard, ISO-13528 on statistical methods for use in proficiency testing by interlaboratory comparisons provides appropriate standards.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.