The effect of target values on the performance of photometric glucose results in a general clinical chemistry EQA-scheme

Labquality, an independent Finnish EQA provider, organises a general clinical chemistry program six times a year. In this scheme, the clients can respond to up to 50 analytes, and they fill in their method and device information together with their results. In this scheme, transferred values from NFKK Reference Serum X are used as the target value for 16 components. For the remainder of the components, the assigned values are consensus values calculated according to the ISO 13528 algorithm A. Sometimes samples with reference method values are also used.