On microscopic examination after centrifugation of normal adult clean intermediate urine, the leukocyte count should be less than 5/HP or less than 70,000 leukocytes per hour excreted in men and less than 140,000 in women. If the urine contains more leukocytes and/or pus cells is called leukocyturia, also known as pus urine. The term pus cells refers to white blood cells that have degenerated and died. When there are a small number of leukocytes in the urine, they can only be found under a microscope, and when there is a large amount of pus urine, the urine can be seen with the naked eye as cloudy or even milky white. The types of leukocytes in urine mainly include neutrophilic polymorphonuclear leukocytes, eosinophils and lymphocytes, and the clinical significance of different types of leukocyte urine varies. The number of leukocytes in the urine is also affected by a variety of factors, including: 1, urinary pH, when the urinary pH is elevated, leukocytes are easily destroyed; 2, urine volume, a large amount of water to reduce the urinary osmotic pressure, leukocyte destruction, urinary leukocyte count decreased; 3, urine specimen placement, urine specimens left for a longer period of time, but also the destruction of urinary leukocytes and the number of reduced.