Many people come to see a doctor for a routine urine test, and after reading the test, the doctor asks them to keep the test again. People wonder why they have to repeat the test once. This may be because your urine specimen was not left correctly, interfering with our judgment of the results. What is the correct way to collect a urine specimen for a routine urine test? Proper collection of urine specimens is important for routine urinalysis and can directly affect the results if done incorrectly. For most people who need to have their urine checked, the following aspects should be noted when keeping urine specimens: (1) It is best to keep the first urine sample early in the morning for urine routine tests to ensure that the urine has been in the bladder for 4 to 6 hours. Fresh urine specimens should be kept in a clean container and sent for examination in a timely manner (not more than 1 hour), and more attention should be paid in summer. For routine urine examination, the urine should be no less than 10 ml. (2) Urine specimens must be clean. Women should clean their vulva and not mix in leukorrhea. (3) Retain the middle section of urine. A urine discharge can be divided into anterior, middle and posterior segments according to the sequence (note that you should urinate directly at one time, not intermittently divided into three urine). The anterior and posterior segments of urine are easily contaminated. Therefore, when doing urine routine and bacteriological examination of urine, the middle segment of urine is usually retained. Be careful not to put the urine cup directly under your body when you keep urine (especially for women), it is better to put it under your body in front so that the urine left is not easily contaminated. (4) For people with urinary tract infections, white blood cells in urine are often intermittent, so it is best to repeat the test several times. If the test is done after antibiotic treatment, the accuracy of the test will be affected.