Kit and method for assaying creatinine

The invention relates to a kit and a method for assaying creatinine. The kit includes a first reagent group and a second reagent group. The first reagent group includes creatinase, sarcosine oxidase, chromogen and catalase; the second reagent group includes creatininase, 4-amino antipyrine and peroxidase. The chromogen is selected from N-(2-hydroxyl-3-sulfopropyl)-3,5-dimethoxyaniline or a sodium salt thereof, and N-ethyl-N-(2-hydroxyl-3-sulfopropyl)-3,5-dimethoxyaniline. The kit and the method can reduce interference during the detection of the creatinine due to the calcium dobesilate and/or etamsylate that exist in a sample.