7AACC.Purpose of the NGSP. http://www.ngsp.org/prog/in-dex.html . 2008
8International Organization for Standardization.Medi- cal Laboratories Particular Requirements for Quality and Competence[].ISO.2003
9International Organization for Standardization.In Vitro Diagnostic Medical Devices—Measurement of Quantities in Samples of Biolog-ical Origin-Metrolngicul Traceability of Values Assigned to Calibra-tors and Control Materials[].ISOl.2003
10Fraser CG,Petersen HP.Analytical performance characteristics should be judged against objective quality specifications[].Clinical Chemistry.1999