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Dark urine is most commonly due to dehydration and concentrated urine. However, it may be an indicator that excess, unusual, or potentially dangerous waste products are circulating in the body. For example, dark brown urine may indicate liver disease due to the presence of bile products.
Urine hemoglobin: The presence of free hemoglobin in the urine, an abnormal finding, that may make the urine look dark. Hemoglobin in the urine is termed hemoglobinuria.Hemoglobin is the protein in the red blood cells which carries oxygen from the lungs to the tissues of the body and returns carbon dioxide from the tissues to the lungs. The iron contained in hemoglobin gives red blood cells their characteristic color.ormally, there is no hemoglobin in the urine. Hemoglobinuria is a sign of a number of conditions including: 1  acute nephritis (acute glomerulonephritis), 2  burns, 3  kidney cancer, 4  malaria, 5  paroxysmal nocturnal hemoglobinuria (dark urine in the morning that lightens up during the day),