Usually occult blood three plus sign is in the three major routine urinalysis that has occult blood. What does it mean? It is the presence of red blood cells during the urine test, and if the amount of red blood cells is more, it is three plus sign. If the amount of red blood cells is less than three, it is negative for occult blood, and if it is more than three, it is positive for occult blood. Depending on the amount of occult blood, it can be categorized into indicators of 1, 2, 3 and 4. Occult blood three plus, occult blood is considered to be more, it is seen in the following diseases, usually stones or tumors, some of them are due to the patient’s poor coagulation function, bleeding. Therefore, once the occult blood three plus sign, must do the coagulation function examination, and then do the renal ultrasound, see the urinary system, such as the kidney, ureter, bladder, these locations have no tumor or tuberculosis.