Positive erythrocytes suggest the presence of hematuria, undamaged erythrocytes account for more than 90% of non-glomerular hematuria, erythrocytes account for 90% of undamaged erythrocytes in the urine test, such as temporary microscopic hematuria is mostly normal, without special treatment; such as urologic diseases, reproductive diseases, renal vein thrombosis and systemic diseases caused by bleeding is not normal. Urinalysis undamaged erythrocytes account for 90% is mainly due to lesions below the glomerulus, there is no erythrocytes through the glomerular basement membrane caused by the extrusion of the damage, and thus the erythrocyte morphology is normal. Commonly found in the following cases. 1. Temporary microscopic hematuria: common in adolescents and young people after strenuous exercise, hasty marching, cold water bath, standing for a long time or heavy physical labor and female patients menstrual blood pollution and so on. At this time is mostly normal, without special treatment. 2. Diseases of the urinary system: acute and chronic infections of the bladder and the following parts, stones in the renal pelvis, ureter or bladder; tumors, tuberculosis, trauma; congenital renal vascular malformations such as arteriovenous fistulae, hemangiomas; congenital urogenital anomalies such as renal cysts, hydronephrosis and so on. 3. Diseases of the reproductive system: common diseases such as prostatitis and vesiculitis. 4. Renal vein thrombosis and bleeding caused by systemic diseases: common in immune thrombocytopenic purpura, hemophilia, aplastic anemia and other diseases. If you find the urine red blood cells positive, undamaged red blood cells accounted for more than 90% of the recommendations to the hospital as soon as possible, timely identification of the causes, in accordance with the doctor’s instructions to be targeted treatment.