ABSTRACT
21.5. Accreditation bodies also recognize the benefit of these schemes as objective evidence of competence of the laboratory and of the effectiveness of the assessment process itself. Where possible, laboratories should select proficiency testing schemes which operate according to good international practice (Ref. C7) and have transparent evidence of quality, e.g. by accreditation or other peer review (Ref. B16). Accredited laboratories are normally required to participate in proficiency testing (where suitable schemes exist) as an integral part of their QA protocols. It is important to monitor proficiency testing results as a means of checking performance and to take corrective action as necessary.
