Urine sediment examination or routine urine examination, if the urine occult blood is negative, it is normal and there is no need to worry or any treatment. Under normal circumstances, urine does not contain red blood cells, if combined with bleeding disorders, blood mixed in the urine, through microscopic examination, observed in each high-powered field of view, the number of red blood cells greater than 3, can be diagnosed as microscopic hematuria, which is can appear as a positive result of occult blood, it is necessary to further line urinary system ultrasound, CT or culture and other tests, or even further examination of kidney function, to understand or determine the cause of hematuria. to understand or determine the cause of hematuria. When there is no hemorrhagic lesion in the urinary system or nephritis-related lesion, there will be no red blood cells in the urine, and the occult blood test will be negative, which is normal and does not require any treatment.