Predict the Performance of the QC Procedures

You can predict the performance of a QC procedure using probability calculations or computer simulation studies. It is important to know before selecting a QC procedure what the probability is that the procedure will detect a critical systemic error and the probability that the procedure will produce false rejections.

The optional Westgard Advisor™ online calculates the probability of error detection (P_ed) and the probability of false rejections (P_fr) for each recommended SPC rule and number of control samples combination. Each of these values is shown on the Westgard Advisor™ online Report with the P_ed corresponding to the detection level expressed as AQA (SE).

Note: AQA (SE) is the percent of analytical quality assurance (AQA) for systematic error (SE) and indicates the chance of detecting medically important systematic errors. Percent AQA (SE) is synonymous with probability of error detection (P_ed).