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Long-term evaluation of EQA data in Croatia

In 2004, during the course of Croatia´s accession to the European Union together with implementation of accreditation standard (ISO 15189) we started with project of harmonization of laboratory results governed by the Croatian Society of Medical Biochemists (Committee for External Quality Assessment of MBLs), Croatian Chamber of Medical Biochemists and Institute of Clinical Chemistry Clinical Hospital Merkur: Reference centre of the Ministry of Health for the production of reference values. The main goals of this project were: analytical comparability of the results based on recommended analytical methods as well as clinical comparability of the results based on reference intervals produced for Croatian population. For the long-term evaluation of EQA results we calculate the performance statistics graphically using z-scores in other to demonstrate the variability of obtained results and identifies trends. In order to monitore qualitative results (in urine analysis) we use the ratio of acceptable to unacceptable results. Based on the results of these ongoing long-term evaluation, the major benefits of EQA are to (1) enhance patients care through improved analytical quality and working conditions in the medical biochemistry laboratories in Croatia ; (2) to evaluate laboratory results across different methods and different reagents ; (3) to identify medical- biochemical laboratories with poor performance and unacceptable results ; (4) to evaluate possible sources of error ; (5) to satisfy accreditation standard and regulatory requirements of Croatian Chamber of Medical Biochemists

Long-term evaluation; EQA data in Croatia; performance statistics; clinical comparability of the results

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