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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),
Blood in the urine, called hematuria, can be benign, idiopathic or a sign of a kidney stone, infection or tumor in the urinary tract. It may signal a problem with the prostate. Or possible lead or mercury poisoning. Or a group of rare inherited disorders known as porphyrias. Red urine is a red flag to immediately consult a physician. 11. Green. Eating asparagus does this for some people, though many more people note the vegetableâs odorous effect upon their urine. Some medications and food dyes produce harmless green urine too, but it can also signal a bacterial infection in the urinary tract. Ask your doctor. 12. Blue. Some medications and food dyes produce bluish urine. So too does a rare inherited metabolic disorder known as familial hypercalcemia or âblue diaper syndrome,â which is characterized by incomplete intestinal breakdown of tryptophan, a dietary nutrient.