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The application of data from proficiency testing to laboratory accreditation according to ISO 17025
Authors:Kaj Heydorn
Affiliation:(1) Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark;(2) Present address: IBX International, Frederiksborgvej 127, 4000 Roskilde, Denmark
Abstract:Current methods of testing laboratories for their proficiency in reporting correct measurement results are liable to substantial errors of the second kind. This means that laboratories with deflated uncertainties are accepted as proficient, even though their reported measurement results pave the way for erroneous conclusions. Only by using E n numbers based on an accepted reference value with the lowest possible uncertainty can the risk of recognising incorrect measurement results be kept at an acceptable level. Based on an actual set of proficiency test (PT)-data for the concentration of Pb in water, this paper compares PT results obtained by methods using E n numbers with methods based on z-scores. Kaj Heydorn is a technical assessor at The Danish Accreditation and Metrology Fund (DANAK).
Keywords:Laboratory accreditation  Proficiency testing   E n numbers   z-scores  Errors of the second kind  Type II error  Fiddle factor
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