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Table 1 Definition and staging for acute kidney injury

From: Duration of acute kidney injury and mortality in critically ill patients: a retrospective observational study

  Serum creatinine criterion Urine output criterion
Stage 1 ≥ 0.3 mg/dl increase within 48 hours or 1.5–1.9 times baseline < 0.5 ml/kg/h for 6–12 hours
Stage 2 2.0–2.9 times baseline < 0.5 ml/kg/h for ≥ 12 hours
Stage 3 ≥ 3.0 times baseline or increase in serum creatinine to ≥ 4.0 mg/dl, or initiation of renl replacement therapy < 0.3 ml/kg/h for ≥ 24 hours or anuria for ≥ 12 hours