Severity stage

Serum creatinine

Urine output

1

- rise ≥ 0.3 mg/dl (26.5 µmol/l) over 48 hours

- increase of 1.5 to 1.9 times the baseline value over 7 days

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

2

- 2 to 2.9 fold increase on baseline

- oliguria < 0.5 ml/kg/h for more than 12 hours

3

- elevation ≥ 3 times the basal value

- elevation ≥ 4.0 mg/dl (≥353.6 µmol/l) or initiation of extrarenal purification

- oliguria < 0.3 ml/kg/h for more than 24 hours

- anuria for 12 hours.