Looking at 86.6% undamaged red blood cells alone is not meaningful and usually does not determine normalcy; it needs to be analyzed in conjunction with the number of red blood cells per high magnification. If the number of red blood cells per high magnification is less than 3, any percentage of undamaged red blood cells is normal. If the number of red blood cells per high magnification is greater than 3, it is abnormal regardless of the percentage of undamaged red blood cells. At this point, the source of the red blood cells can be roughly inferred from the percentage of undamaged red blood cells. If the percentage of undamaged red blood cells is greater than 80%, it is considered that there are urinary tract infections, urinary tract stones, tumors and other causes. If the percentage of abnormal red blood cells is greater than 80%, it is considered to be caused by glomerulonephritis and other causes of renal hematuria. The appearance of hematuria can not be based solely on the urine routine for the source of judgment, need to be combined with the urinary tract ultrasound, urine erythrocyte morphology examination and other related tests to determine.