Leukocytes (++++) in urine often indicate the possible existence of urinary tract infection, but there may also be a case of bacterial contamination of urine, this contamination is the contamination of the patient after the retention of urine specimens, rather than the occurrence of infection in the body, you need to go to the hospital for further urine culture examination, for the relevant conditions for consultation, to determine the presence of infection. After the infection is usually accompanied by urinary frequency, urinary urgency, painful urination and other urinary tract irritation symptoms, while the pathogenic bacteria increase, the human body’s white blood cells into the urine to engulf the pathogenic bacteria, so there will be an increase in the number of white blood cells, engulfing the pathogenic bacteria of the white blood cells will form pus cells, with the urine out of the body, this is the urine culture, generally can be cultured pathogenic bacteria, belonging to a kind of infection. It is also possible that the urine specimen is left for too long after the urine is retained, in principle, it should be sent for examination within 15 minutes, if it is left for more than half an hour in the hot season, it is inevitable that the urine will be corrupted, deteriorated and bacteria breeding, at this time the examination can find an increase in the number of white blood cells, but at this time the patient does not have any conscious symptoms, it is necessary to carry out a urine culture examination, if the urine culture is negative, it does not If the urine culture is negative, it does not indicate the presence of infection and does not need to be treated as such.