Pre-pregnancy physical examination, pre-marital physical examination, test tube to help the pre-pregnancy screening need to test the urine routine test, many women hurriedly left the urine to send the test, the results of the test results of a variety of abnormalities. Here to briefly talk to you about a few precautions to take urine tests. 1, avoid the menstrual period before and after 3 days. Because the menstrual period to stay urine, easy to mix with menstrual blood, resulting in urine routine results show positive red blood cells, can not be distinguished from pathological hematuria. 2, avoid fasting to stay urine. The urine retained when hungry tends to have ketone bodies, which is physiological. It is recommended to retain urine half an hour after eating.3, pay attention to cleanliness. Because the urethral opening is very close to the vaginal opening, it is easy to mix vaginal secretions when retaining urine, so it is recommended to wipe the vulva with a paper towel before retaining urine.4, retaining mid-stream urine. In order to further minimize the interference of vaginal secretions, please discard the initial section of urine, starting from the middle of the urine, the latter section of urine should also be discarded. 5, generally retain 30ml of urine can.