Quality control log with CUSUM and clinically useful limits criteria.
We describe a quality control (QC) log including its advantages over the more commonly used Levey-Jennings and Shewart graphic charts. It represents a practical system of analytic quality control for quantitative assays in clinical chemistry. It utilizes cumulative sum (CUSUM) techniques and comparison of means to monitor acute and chronic analytic drift, respectively. Clinically useful limits (CUL) criteria for QC decisions are used. An algorithm to facilitate the description of, training for, and use of, the QC log system is provided.
D002624:Chemistry, Clinical / Q000592:standards*; D004282:Documentation; D005568:Forms and Records Control; D007256:Information Systems; D008433:Mathematics; D011786:Quality Control; D011996:Records