what is rbc urine definition
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.