Evaluation of the quality of the total testing process of a laboratory is very important to assure that the results supplied by the laboratory are correct and can be used for decisions by the personnel ordering the tests. In this paper Proficiency Testing (PT) or External Quality Assessment (EQA) is described. PT is...

The concept of “metrological traceability” is important when establishing comparable clinical decision limits for a measured analyte at different hospitals within one country and in different countries.  This can only be achieved if all instrument manufacturers establish the performance characteristics of their...