In medicine, hemoglobinuria's a condition in which the oxygen transport protein hemoglobin's found in abnormally high concentrations in the urine. The condition's often associated with hemolytic anemia, in which red blood cells are destroyed, thereby increasing levels of free plasma hemoglobin. The excess hemoglobin's filtered by the kidneys, which release it into the urine, giving urine a red colour. Causes Acute glomerulonephritis Burns Renal cancer Malaria Paroxysmal nocturnal hemoglobinu… (More on Hemoglobinuria)