Several vendors offer urea test kits to detect the level of urea in a biological sample. Urea, which contains two amino groups, is an important metabolite responsible for maintaining ammonium levels in the body. Abnormal urea levels could be indicative of nephritis, liver disease, urinary tract obstruction, or diabetes. Colorimetric urea test kits use a chromogenic reagent that forms a colored complex with urea. The intensity of the color at 520 nm is directly proportional to the concentration of urea in the sample. Urea test kits can be used to assess kidney function. Visit the suppliers of the urea test kit for more details, including kit components.