Morning urine retention of a few hours depends on the test project, measuring urine amylase and lipase retention of 2 hours, do urine osmolality test sealed conditions to save 15 hours, etc., different test projects urine retention time is different. Morning urine is the first urine discharged early in the morning, the requirements in the morning at five or six o’clock first discharged a nocturnal urine, after more than an hour and then retained urine as a specimen, this time there is no contamination of the urine, the cellular morphology is normal, the results of the test is more realistic. Morning urine retained for a few hours depends on the test items, urine culture drug sensitivity test retained specimens immediately after the test, the measurement of urine amylase and lipase retained within 2 hours, retained morning urine to do tuberculosis culture or smear test to collect 12 hours of urine, urine osmolality test sealed under the conditions of preservation of 15 hours, to do the 24-hour urinary protein assay retained a day of time of the urine. Patients are advised to find out what to do with the urine specimen before following the doctor’s instructions for the proper retention of morning urine.