Urine test can be done with 5-10ml of urine, if not enough 10ml, more than 5ml is fine. It is important to keep the morning urine as much as possible, and to keep fresh urine and send it to the test within 30 minutes, and the urine needs to be kept in a measuring cup or a measuring cylinder. Do not use exogenous substances during urine collection to avoid contamination of the urine. Do not drink a lot of water before urine retention to avoid dilution of urine, which may lead to inaccurate urine test results. For special tests, such as urine culture tests, it is necessary to retain clean mid-stage urine and avoid using anterior or terminal urine for testing. Try not to take oral antibiotic medications while retaining urine as this may cause inaccurate test results. If the urine is checked for the presence of infection, but oral antibiotics have been taken, resulting in the bacteria being inhibited and the urinary tract infection not being measured, mistakenly believing that the urinary tract infection is cured, leading to discontinuation of the medication and recurrent urinary tract infections.