AKIN criteria definition and classification of AKI.
Stage
Serum creatinine and urine output criteria
1
Serum creatinine increase of ⩾26.4 umol/L (0.3 mg/dl) or to 150–200% of baseline or urine output < 0.5 ml/kg/h for >6 h
2
Serum creatinine increases to >200–300% of baseline or urine output < 0.5 ml/kg/h for >12 h
3
Serum creatinine increases to >300% of baseline or serum creatinine ⩾354 umol/L (4 mg/dl) with an acute rise of at least 44 umol/L (0.5 mg/dl) or urine output < 0.3 ml/kg/h for 24 h or anuria for 12 h
