OLiguria phase Oliguria Urine volume 400 ml /day, or <50ml /day(anuria) It usually occurs in one day after renal damage and lasting 1-2 weeks. The longer the time last the worse the prognosis is a duration more than one month indicates that the necrosis of tubule is very severe 3333 Oliguria: Urine volume < 400 ml / day, or <50ml / day (anuria) It usually occurs in one day after renal damage and lasting l-2 weeks. The longer the time last, the worse the prognosis is A duration more than one month indicates that the necrosis of tubule is very severe. l) Oliguria phase