The time to collect urine: Any time to discharge urine can be done for routine laboratory tests. General kidney disease patients in order to observe the results before and after the provisions of the first urine early in the morning to send the test. The amount of urine sent for examination: generally 5 to 10 ml. Jin Yan, Jinan City Hospital of Traditional Chinese Medicine nephrology specialist Retaining urine specimens should be taken from the middle urine: that is, a portion of the urine is first discharged and discarded to flush out the bacteria that remain in the urethra and front urethra, and then the middle urine is retained for examination. Care should be taken not to bring non-urine components into the urine: for example, female patients should not mix in leukorrhea and menstrual blood, and male patients should not mix in prostate fluid, etc.