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A procedure for detecting proteins in fluids (particularly body fluids) which involves contacting such fluid with a composition comprising copper in a form capable of forming a copper/protein complex, a peroxide and a redox indicator which provides a detectable response when oxidized, together with

A procedure for detecting proteins in fluids (particularly body fluids) which involves contacting such fluid with a composition comprising copper in a form capable of forming a copper/protein complex, a peroxide and a redox indicator which provides a detectable response when oxidized, together with an ionizable phosphate containing compound to prevent interference with the redox indicator from substances present in the fluid.

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A method for the detection of a protein in a fluid system which method comprises contacting said fluid with a reagent composition comprising copper in a form capable of forming a copper/protein complex, a peroxide and a redox indicator which produces a detectable response when oxidized by the peroxi

A method for the detection of a protein in a fluid system which method comprises contacting said fluid with a reagent composition comprising copper in a form capable of forming a copper/protein complex, a peroxide and a redox indicator which produces a detectable response when oxidized by the peroxide in the presence of the copper/protein complex together with an ionizable phosphate containing compound which compound is: [Figure] A. wherein 2, 3, 4 and 5 are selected from the group consisting of [Figure] [Figure] 1 is any of the above or －O－and m and n are independently 0 or 1; or [Figure] B. wherein R is OH or substituted or unsubstituted phenyl and M is H or a metallic cation. A reagent system which comprises copper in a form capable of forming a copper/protein complex when contacted with protein in solution, a peroxide, a redox indicator which produces a detectable response when oxidized by the peroxide in the presence of the peroxidatively active copper/protein complex and an ionizable phosphate containing compound which compound is: [Figure] A. wherein 2, 3, 4 and 5 are selected from the group consisting of [Figure] [Figure] 1 is any of the above or －O－and m and n are independently 0 or 1; or [Figure] B. wherein R is OH or substituted or unsubstituted phenyl and M is H or a metallic cation.