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This protein consists primarily of low-molecular-weight serum proteins that have been filtered by the glomerulus and proteins produced in the genitourinary tract. Highly pigmented urine and contamination of the container with quaternary ammonium compounds, detergents and antiseptics also cause false-positive readings. Intestinal bacteria reduce the bilirubin to urobilinogen , which is later oxidised and either excreted with the faeces as stercobilin or in the urine as urobilin.


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