laboratory quality control randox quality control randox qc healthcare hospital external quality assessment riqas clinical laboratory acusera quality control laboratory randox proficiency testing laboratory performance patient testing patient care health eqa pt qc medical laboratory interlaboratory data management acusera 247 qc multi rules internal quality control third party control guide patient health point of care point of care testing interlaboratory peer group clinical chemistry third party help education reference ranges software levey jennings six-sigma measurement of uncertainty linearity calibration verification commutability iso 15189 poct multi-rules total allowable error error detection qc procedures using qc multi-rules uso de multireglas cc qc poster uncertainty healthcare. external quality assessment educational patient ensuring qc procedure accurate medicine results systematic error random error troubleshooting error identification and classification data management
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