Patent ID: 8460877

Claim:
A method of measuring a protein in a liquid sample that also contains creatinine, the method comprising: a step of mixing a quantity of the liquid sample with a protein measurement indicator to form a first liquid system in which the protein and the creatinine react with the protein measurement indicator, wherein the protein measurement indicator is a halogenated xanthene dye or a triphenylmethane dye; a step of obtaining a first response value that reflects a protein concentration in the liquid sample, based on coloring of the protein measurement indicator caused by a reaction between the protein and the protein measurement indicator under influence of a reaction between the creatinine and the protein measurement indicator; a step of preparing another quantity of the liquid sample that does not contain the protein measurement indicator; a step of obtaining a second response value that reflects a creatinine concentration in the another quantity of the liquid sample; and a step of calculating a protein concentration in the liquid sample, by using the first response value and the second response value, for eliminating a measurement error caused by the reaction between the creatinine and the protein measurement indicator in the first liquid system.