Stage

Serum creatinine

Urine output

1

1.5 - 1.9 times baseline OR ≥ 0.3 mg/dl (≥26.5 mmol/l) increase

<0.5 ml/kg/h for 6 - 12 hours

2

2.0 - 2.9 times baseline

<0.5 ml/kg/h for ≥12 hours

3

3.0 times baseline OR Increase in serum creatinine to ≥353.6 mmol/l) OR Initiation of renal replacement therapy OR, In patients <18 years, decrease in eGFR to <35 ml/min per 1.73 m

<0.3 ml/kg/h for ≥24 hours OR Anuria for ≥12 hours