How much urine does an adult produce in a day?
Generally speaking, the normal urine volume for a healthy adult should be approximately 700-2000ml/24h, averaging 1500ml/24h. If the urine volume decreases to less than 400ml per day, it may be due to insufficient kidney function or insufficient water intake. If the daily urine volume exceeds 2500ml, it may indicate excessive water intake or the possibility of diabetes insipidus. Both oliguria and polyuria require further examination, including urine osmolarity, urine microprotein, and 24-hour creatinine clearance rate, to determine the underlying cause.
Polyuria refers to a urine volume exceeding 2.5L in 24 hours. Physiological causes include excessive water intake, drinking strong tea or coffee, mental stress, and insomnia. It can also be seen when using diuretics or excessive intravenous infusion. Pathological causes are often due to decreased reabsorption and concentration function of renal tubules, such as diabetes, diabetes insipidus, chronic nephritis, and neurologic polyuria.
Oliguria refers to a urine volume less than 400ml/24h. A sudden decrease in urine volume is a sign of acute renal failure, which may be caused by shock, dehydration, severe burns, acute or chronic nephritis, cardiac insufficiency, ascites due to liver cirrhosis, uremia, and renal failure. Anuria refers to a urine volume less than 100ml/24h, which is only the maximum secretory capacity of the urothelium in 24 hours. Persistent anuria is seen in organic renal failure, manifesting as azotemia or uremia.
If you have symptoms such as abnormal urine volume or discomfort during urination, it is recommended to seek medical attention promptly to avoid delayed treatment.
