Patent ID: 8192996

Claim:
An enzyme solution for glycated hemoglobin measurement, comprising an aqueous solvent and an enzyme suitable for glycated hemoglobin measurement and a tetrazolium compound that are dissolved in the aqueous solvent, wherein sodium azide further is dissolved in the aqueous solvent, wherein a concentration of the sodium azide in the enzyme solution is in a range from 0.01 g/L to 0.10 g/L, wherein the enzyme solution is stored for at least 5 days, and wherein spontaneous color development of the tetrazolium compound is suppressed and a function of the tetrazolium compound to preclude an influence of a reducing substance in a measurement of a hemolysate sample utilizing a redox reaction is maintained for at least 5 days after start of the storage of the enzyme solution, as compared with a tetrazolium compound stored in a solution in the absence of the sodium azide.