Laboratory urine samples, generally not more than three hours, different conditions need to be sent to the time window is not the same, it is best to send fresh urine directly to the test, the results will be more accurate. Normally speaking, the basic urine test to stay in the middle of the urine after the examination, the faster the examination of the corresponding specimen of the greater significance of the guidance. Ordinary examination of urine samples, do not leave more than three hours, the need to check the cellular status of urine and urine culture, it is best to send the test within one hour. Cells in the urine that are not tested for a long period of time can disintegrate, affecting the accuracy of the results. The day before the urine test to avoid eating too stimulating too greasy food, fasting in the morning to check, retained mid-range urine specimens, found abnormalities, in the clinician’s guidance for standardized treatment, to avoid delayed condition.