RBC in urine, or hematuria, can be a sign of infection, irritation, or a chronic condition. Learn how to test for RBCs, what the normal range is, and what to do if you have them. The presence of red blood cells (RBCs) in urine can indicate underlying health issues, such as problems with the urinary tract, kidneys, or bladder. The RBC urine test is used to measure the number of red blood cells in a urine sample. Typically, a count of less than 2 to 3 RBCs per high-power field (HPF) is considered normal, while a higher value may indicate hematuria. Hematuria is a condition where blood is present in the urine, which can be microscopic or visible to the naked eye. It is ... Blood in urine (hematuria)? Learn the causes, symptoms, investigations and when to seek urgent care. Early diagnosis is key. Hematuria is the presence of red blood cells (RBCs) in the urine. It can have various causes, some serious and some not, and it can be diagnosed with urine tests and imaging tests.