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. |