Table 1.

RIFLE classification for AKIa

RIFLE ClassificationCreatinine and GFR CriteriaUO Criteria
RiskIncreased creatinine ×1.5 or GFR decrease >25%UO <0.5 ml/kg per h ×6 h
InjuryIncreased creatinine ×2 or GFR decrease >50%UO <0.5 ml/kg per h ×12 h
FailureIncreased creatinine ×3 or GFR decrease >75%UO <0.3 ml/kg per h ×24 h or anuria ×12 h
LossbPersistent ARF = complete loss of kidney function >4 wk
ESRDbESRD (need for dialysis >3 mo)
  • a AKI, acute kidney injury; ARF, acute renal failure; UO, urine output.

  • b "Outcome" categories.