Oliguria is a medical term referring to a condition characterized by the production of an abnormally low volume of urine, typically defined as less than 400 milliliters per day in adults. It can be a sign of various underlying health issues, including dehydration, kidney dysfunction, or urinary obstruction. Monitoring urine output is important in assessing kidney health and overall fluid balance in patients. If oliguria persists, it may require further medical evaluation and intervention.