Urine occult (occult) blood is a routine urine item. Urine specimen after centrifugal sedimentation of urine under the microscope, more than 2 red blood cells per high-powered field of view is called hematuria, and 10 red blood cells found under high-powered microscope is called urinary occult blood 1 plus, the more plus, the more bleeding. The red blood cell count and morphology also need to be clarified to clarify the cause of hematuria. Causes of urinary occult blood include inflammation of the urinary system, stones in the urinary system, and tumors of the urinary system. In addition, kidney disease can also lead to occult blood in urine. If the urine occult blood test is negative under normal circumstances, or if the urine occult blood test is positive with proteinuria, the first consideration is kidney and bleeding disorders, and further renal function tests and ultrasonography can be done to determine the location and nature of the urine occult blood.