Urine leukocytes (+ + +) often suggests that there may be a urinary tract infection or urine specimen contamination, need to be combined with the patient’s symptoms, urine culture to further determine. When the urinary tract infection when there are more pathogenic bacteria in the urine, the body’s leukocytes will occur immune chemotaxis, into the urine to phagocytosis of pathogenic bacteria, so in the examination of the number of leukocytes can appear to be increased, usually accompanied by urinary frequency, urgency, pain in micturition and other symptoms, and at the same time for the urine culture, the culture of the causative organisms can be diagnosed with the existence of infection. If the urine specimen is contaminated by other pollutants or left for too long, it can also show an increase in the number of white blood cells if it is exposed to high temperatures that cause corruption, bacterial reproduction or deterioration. In principle, the urine specimen needs to be sent within 15 minutes to test the results are more accurate, if contamination or bacterial reproduction of leukocyte count increases, generally do not have urinary tract irritation, need to be further reviewed or urine culture to rule out the presence of infection, if the urine culture is negative for more than suggests that the urine may be contaminated, and it is recommended to re-examine the urine after the observation of the number of leukocytes in the urine is normal.