Try not to eat before the urine test, and choose a fasting time for the test to avoid abnormal changes in urine pH or specific gravity, electrolytes, etc. after eating, which may lead to inaccurate test results, so it is better not to eat during the urine test and to conduct the test on an empty stomach. At the same time, urine specimens need to be sent in a timely manner, as much as possible within 30 minutes of the urine specimen, too much time may lead to urine spoilage and inaccurate test results. The concentration of solutes in urine is relatively high and the test results are more accurate, so it is easy to find some suspicious or problematic cases. Do not drink a lot of water within half an hour to avoid dilution of urine, which may lead to inaccurate urine test results. When taking a urine specimen, try to choose a clean middle section of urine for examination, that is, when urinating, not the front and end, as long as the middle section is examined, the results are relatively accurate.