PROBLEM TO BE SOLVED: To obtain a reagent for measuring creatine kinase, capable of stably and accurately measuring creatine kinase activity for a long period of time and to provide a method for measuring creatine kinase activity. ;SOLUTION: In a reagent for measuring creatine kinase activity containing a thiol compound or a method for measuring creatine kinase activity, the reagent contains an oxoacid comprising sulfur as a central atom such as sulfoxylic acid, sulfurous acid, thiosulfurous acid, thiosulfuric acid, dithionous acid, disulfurous acid, dithionic acid, disulfuric acid, a polythionic acid, or its thio-acid or its salt.;COPYRIGHT: (C)1997,JPO
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