Six Sigma indicates the international quality level. The purpose was to meet the quality requirements of ‘zero defects’. Six Sigma is a technology that can improve the quality process management of enterprises, and it was first applied at Motorola. Westgard took Ma圎 (NUF) = 1 as the target to determine run size and established Westgard sigma rules with the run size. However, many SQC design tools fail to clearly provide the SQC frequency selection and design parameters required for continuous analysis process. It is recommended to design a limited interval SQC for continuous analysis processes, that is, to implement a quality control event before and after testing a limited group of samples, and the number of samples in this group is the run size, the number of quality control (QC) events in the continuous analytical process is the QC frequency. ![]() Recommend the implementation of risk‐based statistical quality control (SQC). The Clinical and Laboratory Standards Institute (CLSI) C24‐ED4 guidelines
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