Adults usually urinate around 300 ml to 500 ml at one time, there is no fixed standard. Urinary output refers to the amount of urine discharged by the human body in a single urination. There is no constant standard for how much urinary output is normal in a single urination. The amount of urine is affected by a variety of factors, such as drinking water, sweating, holding urine, diuretics, etc. will affect the amount of urine per time or per day. Currently, 24-hour urine output is usually counted in medicine, and a normal person’s 24-hour urine output is around 1,500 to 2,000 milliliters; a 24-hour urine output of less than 400 milliliters is considered oliguria, a 24-hour urine output of less than 100 milliliters is considered anuria, and more than 2,500 milliliters is considered polyuria. If the total amount of urine in a day is abnormal, it is recommended to go to the hospital for relevant examination and treatment under the guidance of professional doctors.