title: The Ca(2+)-standardization of Japan only may cause problems for the importation of foreign analyzers.
abstract: A serum based reference material for Ca2+ measurement has been established in Japan. cCa2+ in the reference material was assigned with a IFCC reference cell. Some improvements of the IFCC reference cell are described. A few non-Japanese Ca2+ analyzers have given very inaccurate results with the reference material. The Japanese authorities can therefore be expected to hamper their importation in the future. A world-wide external quality assessment scheme with the Japanese reference material is suggested to further identify and solve the problems.
authors.affiliation: Chemicals Inspection and Testing Institute, Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Umemoto
mesh_terms: D002118:Calcium / Q000032:analysis* / Q000097:blood*; D006801:Humans; D007564:Japan; D013677:Medical Laboratory Science / Q000295:instrumentation / Q000592:standards*; D011199:Potentiometry / Q000295:instrumentation* / Q000592:standards; D012016:Reference Values
chemical_list: D002118:Calcium