Urinary sediment examination is to determine whether the patient suffers from urinary system diseases by observing the urine sediment after centrifugation under the microscope. Such as urinary tract infections, or tumors, stones, etc., as follows. 1. Urinary system infection: leukocytes greater than 5 that is under the high power microscope field of view under the microscope pus urine. 2. Tumor, stone: red blood cells greater than 3 is the high power microscope field of view under the microscope hematuria. Any time can do urine sediment examination, take the specimen is generally recommended to take the morning urine in the middle urine, specimen volume of 5-10ml is appropriate. It is important to note that when taking the specimen, do not bring in other components, so as not to affect the accuracy of the test results, such as female leukorrhea.