The quality assurance system in clinical chemistry.

摘要: The quality assurance system in clinical chemistry allows for the identification of errors and control actions to correct them. It is well known that laboratory can be classified as: pre-analytical, analytical post-analytical. While pre-analytical post-analytical are very difficult identify, variability (both imprecision inaccuracy) monitored with internal (IQC) programs external assessment (EQA) schemes. purpose IQC mainly verify stability estimates time therefore it essentially a imprecision. based on use samples which analyzed each series. easiest method representing data by Shewhart's chart, although "cusum" chart Youden plot often useful. As criteria according an series should accepted or rejected, practical rules widely spread laboratories. Participation EQA schemes have retrospective estimate its performance terms both inaccuracy, if definitive reference methods available. In lack methods, consensus mean median derived from obtained all participants or, some cases, using same (e.g. analytes not yet completely characterized measured immunoassays.