The presence of more than 3 red blood cells (erythrocytes) in the urine indicates bleeding. Abnormal red blood cell counts may also suggest a problem; normal ranges are 4.7–6.1 million cells/microliter for adult males, 4.2–5.4 million cells/microliter for adult females, 4.8–7.2 million cells/microliter for newborns, and 4.6–4.8 million cells/microliter for children.