What term refers to a reduced urine output of less than 400 mL per day?

The term for a reduced urine output of less than 400 mL per day is known as oliguria. This condition indicates that the kidneys are producing an insufficient amount of urine, which can be a sign of various underlying health issues, including dehydration, kidney disease, or obstruction in the urinary tract. Oliguria is typically a concern in clinical settings, as it can lead to or indicate worsening renal function and the potential need for further medical evaluation and intervention.

Polyuria, in contrast, refers to the production of an abnormally large volume of urine, often associated with conditions like diabetes mellitus or diabetes insipidus. Anuria signifies an extreme reduction in urine output, usually defined as less than 100 mL per day, indicating a more severe level of kidney dysfunction. Dysuria describes painful or difficult urination, which is not related to the volume of urine produced. Understanding these distinctions is essential in clinical practice for accurate assessment and appropriate management of patients.