Proficiency Testing(PT) PT schemes also known as external quality assessment (EQA) schemes or laboratory performance studies are one means os assessing the quality of routine measurements. PT schemes are the most common and perhaps the most important, type of interlaboratory comparisons. The primary aim of proficiency testing is to provide a quality assurance tool for individual laboratories to enable them to compare their performance with similar laboratories, to take any necessary remedial action, and to facilitate improvement Advantages of PT Participation in PT enables you to compare your results with those from laboratories. It can also provide you with: -Regular, objective and independent assessment of the quality of your routine analyses -Feedback that stimulates improvement of the technical work -Comparative information about method and instrument performance -Overview of quality of specific analyses in a sector, country or region Limitations of PT Ideally, PT samples are similar in nature to routine samples, and sufficiently homogeneous and stable not to influence the evaluation of participants performance. Due to practical aspects, PT samples are sometimes processed, e.g. Stabilised and/or freeze-dried. Appropriate PT Schemes The huge number of analytes, and the large variety in the way tests are performed, means that it is not always possible to find a scheme that meets a laboratory’s exact requirements. Before signing up for a scheme, carefully check that the test materials, and the analytes and their levels fit your routine measurements. Is the frequency appropriate and doses the provider’s report give you sufficient information? PT in Measurement Quality Correct measurements require both internal and external tools. During the validation step, the performance of the method is established. Subsequent use of control charts will show if the measuremnts are under statistical control. Many laboratories choose to accredit their services, thereby agreeing to implement a quality management system and accepting regular external audits of their work. Participating in PT is an effective external means to check that the procedures are fit for purpose PT Results Because PT schemes provide an overview of the analytical quality for specific applications, the results are increasingly used by laboratories custumers, and by accreditation and regulatory bodies. PT helps identifying measurement problems, which have a direct impact on trade, environmental monitoring and health and safety
Posted on: Fri, 24 Jan 2014 01:47:13 +0000
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