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Introduction
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Proficiency Testing - Introduction All analytical laboratories should operate a quality assurance system which includes internal quality control procedures, participation in proficiency testing schemes, use of reference standards and certification/accreditation to a recognised standard such as ISO 9001 or BS EN ISO/IEC 17025. Of these approaches, only proficiency testing schemes or the use of certified reference materials can establish the bias and accuracy of the results. Proficiency testing schemes operate by providing participating laboratories with samples containing specified material but the actual quantity of the substance is known only to the organisers. The laboratory analyses the samples, preferably as part of their normal routine, and reports the results to the scheme organisers. The laboratory is then provided with a report showing how closely their results agree with the accepted value, and where necessary, can then take appropriate action to improve performance. Regular participation in a proficiency-testing scheme provides independent verification of the analytical competence of a laboratory and shows a commitment to the maintenance and improvement of performance. It demonstrates to the public, customers, accreditation bodies, regulators, and management that analytical procedures are under control and gives analysts confidence that the service which they provide will withstand scrutiny. The cost of participation in a proficiency testing scheme gives good value for money compared with the consequences of producing inaccurate results which might put workers' health at risk, damage a company's reputation or contravene national regulations. Those who make use of analytical laboratories should ensure that the laboratory operates a quality assurance system which includes participation in a proficiency testing scheme where possible. Prospective customers should ask to see results from a laboratory's participation in proficiency testing schemes and satisfy themselves that the laboratory is able to obtain a consistent level of satisfactory performance over a period of time. HSL Proficiency Testing Schemes HSL operates the following proficiency testing schemes in support of workplace and environmental risk assessments: Workplace
WASP DVDPractical tips about how to achieve accurate results.
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