A weak positive urine occult blood is abnormal and further urine review or urine sedimentation is recommended. If the result is still weakly positive or positive, further ultrasound examination of the urinary system is needed. A positive or weakly positive result for occult blood will only occur if there is a bleeding disorder in the urinary tract that results in the presence of red blood cells in the urine. Under normal circumstances, more than 3 red blood cells per high power field of view, there can be occult blood or occult blood positive results, but more than 0 less than 3, there will be a weak positive result, there may be a tiny mucosal epithelial lesions, resulting in local hemorrhage, so there are red blood cells mixed in the urine. If the bleeding stops after the mucosa heals, then the occult blood test is completely negative. If the mucosa does not heal or the irritating or damaging factors persist, the occult blood is weakly positive to positive results, further ultrasound and urinalysis are needed to determine.