For the morning urine specimen retention, mainly the human body in the natural state of wakefulness, in the early morning after waking up, the time between 6-7 o’clock in the morning for the first time to urinate, after urination, the second time when there is a desire to urinate, and then retained in the mid-range urine, for the collection of the morning urine specimen. This specimen can truly reflect the human body early in the morning after waking up, in the absence of water, reflect the standard basal metabolic rate of urine routine examination, the results are more accurate. In the clinical collection of morning urine, the patient should be naturally awakened between 6 and 7 o’clock in the morning, without strenuous activity and without food and water, the specimen of morning urine should be retained for examination, and the results of this examination are more objective. In the urine routine specimen retention of the night before, do not have strenuous exercise and high fat, high salt diet, will affect the results of the specimen.