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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),
Occult blood simply means hidden blood; blood that is not visible, but is still present. Normally there is no blood in the urine. Blood can indicate an infection, kidney stones, trauma, or bleeding from a bladder or kidney tumor.ormally there is no protein detectable on a urinalysis strip. Protein can indicate kidney damage, blood in the urine, or an infection. Up to 10% of children can have protein in their urine. Certain diseases require the use of a special, more sensitive (and more expensive) test for protein called a microalbumin test.