Urinalysis can be done in the afternoon, but with the effects of diet or exercise, there may be some impact on the results. It is usually recommended to collect fresh, just-discharged urine, usually for the first time after waking up in the morning, which is relatively accurate for test results as it is not affected by diet or exercise. The urethra should be cleaned and kept clean and dry during the routine urine test. Avoid contamination. Women need to avoid menstruation to prevent blood from mixing into the urine and causing the illusion of blood in the urine. In addition, it is recommended to choose mid-range urine when performing routine urine examination, which can make the examination results more accurate. If the patient needs to perform routine urine examination, it is recommended to go to a regular hospital to have the examination results prescribed and evaluated by a professional doctor.