Abstract: Test compositions, indicators, and test device are provided which are capable of generating different hues at different analyte concentrations. The compositions are capable of generating a yellow hue in situ. Visual tests for clinically important analytes, such as glucose, are determined by use of two independent catalytic systems which are reactive with reduced nicotinamide adenine dinucleotide to produce a range of hues; the particular hue produced depending on the concentration of the analyte. The invention provides a test device for the determination of analyte, e.g. glucose, in body fluid which exhibits a rainbow of hues, the particular final hue produced depending on the analyte concentration.

Abstract: Test compositions and test devices are provided which are capable of generating different hues at different analyte concentrations. Visual results for clinically important analytes, such as glucose and cholesterol, are provided by use of compositions containing two independent catalytic systems which are reactive with a common substrate generated from the analyte of interest, to produce visual endpoints of different hues for different concentrations of analyte. Preferred formulations provide a RAINBOW of hues, the particular final hue produced depending on the concentration of the analyte.