[Activities of Japanese Committee for Clinical Laboratory Standards (JCCLS) toward standardization of laboratory medicine].

In this review, we summarize the laboratory medicine standardization activity of the Japanese Committee for Clinical Laboratory Standards (JCCLS). The JCCLS cooperates with the Joint Committee for Traceability in Laboratory Medicine (JCTLM). In the near future, we will accomplish a nationwide network system for the standardization of laboratory medicine (Patchwork Standardization-System).