Table 2.

RIFLE classification system (35)

ClassGFR CriteriaUrine Output Criteria
RiskSerum creatinine 1.5×<0.5 ml/kg per h for 6 hours
InjurySerum creatinine 2×<0.5 ml/kg per h for 12 hours
FailureSerum creatinine 3× or serum creatinine ≥4 mg/dl with an acute rise >0.5 mg/dl<0.3 ml/kg per h for 24 hours or anuria for 12 hours
LossPersistent acute renal failure = complete loss of kidney function for >4 weeks
ESRDESRD for >3 months