Creatinine concentration measuring method, measuring device and measuring apparatus, and urinary salt content measuring method, measuring device and measuring apparatus using them

摘要

(A) Mixing a sample containing creatinine with a reagent for quantifying creatinine containing 1-methoxy-5-methylphenazinium under conditions where neither an enzyme acting on creatinine nor picric acid is present, Reducing 1-methoxy-5-methylphenazinium; (B) measuring the amount of 1-methoxy-5-methylphenazinium reduced in step A electrochemically or optically; And (C) a method for measuring creatinine concentration, comprising a step of determining the concentration of creatinine contained in the sample based on the amount of reduced 1-methoxy-5-methylphenazinium measured in step B.