Physical examination urine routine found BLd micro, is a weakly positive urinary occult blood, suggesting that a small number of red blood cells found in the urine. Urine routine found positive urinary occult blood, commonly found in urinary stones, urinary tumors, urinary inflammation, urinary congenital malformation and other conditions. For example, when the patient has urinary stones, the stones cut through the mucosa of the renal pelvis or ureter, which may lead to mucosal rupture and bleeding, and then appear positive urinary occult blood. Physical examination if found weak positive urine occult blood, need to further microscopic examination of urine red blood cell morphology, urine red blood cells for deformed red blood cells, suggesting that hematuria originates from the kidneys, commonly found in IgA nephropathy or allergic purpura nephropathy. If the red blood cells are normal morphology red blood cells, it suggests the possibility of postrenal hematuria. Sometimes normal people may also have false-positive urinary occult blood after strenuous exercise, urine concentration, should be combined with their own specific situation to analyze the cause, if necessary, repeated review of urinary occult blood or further examination, as soon as possible to find out the cause, and effective intervention.