What's the Urinary suppression?

Urinary suppression, also known as oliguria, is a medical condition in which urine production is less than either 20 milliliters per hour or 400 milliliters in a 24-hour period. Although oliguria is reported in most cases of renal failure, these two conditions are not exclusively associated. Urinary suppression is classified as pre-renal, renal or post-renal depending on the cause.