How to distinguish "true" hematuria?

Urine has a genuine distinction. The so-called true hematuria urine that contains red blood cells, including gross hematuria and microscopic hematuria. Patients discharged fresh urine was blood red meat or wash water samples, and even blood clots, gross hematuria; find more red blood cells only under the microscope, microscopic hematuria. Generally believed that in the case of normal life activities, if fresh urine samples without centrifugation, the red blood cells per high power field over 1-3 months; or three-hour urine collection for urinary sediment cell count, the number of male red blood discharge more than 3 per hour million and more than 40,000 women, should be considered hematuria. Most hematuria occurs in diseases of the genitourinary system. Infection, stones direct damage, injury, drugs, cancer, etc., or urinary tract obstruction caused by ruptured blood vessels, or metabolic disorders, immune injury, poisoning, blood clotting disorders, cardiovascular disease and lesions adjacent organs, can cause varying degrees of hematuria.

False hematuria means other than the urinary tract, such as parts of menstruation, uterine, vaginal bleeding, bleeding hemorrhoids or human blood mixed with urine hematuria. In addition, although the urine was red, but still leave hematuria found in the following situations: ① contact or orally as substances such as ammonia, antipyrine, Sulfobromophthalein sodium, rifampin. At this time the urine was red, but microscopic examination and occult blood tests were negative. ② hemoglobin or myoglobinuria common in acute hemolysis, large area burns, crush injuries, snake bites, malaria and arsenic trichloride, phenol, chloroform, carbon monoxide, naphthalene poisoning. At this time no examination found only a small number of red blood cells or red blood cells, and urine occult blood test was positive.