KDIGO staging of AKI.
| Stage | Serum creatinine | Urine output |
|---|---|---|
| 1 | 1.5–1.9 times baseline OR ≥26.5 μmol/L increase | <0.5 mL/kg/h for 6–12 h |
| 2 | 2.0–2.9 times baseline | <0.5 mL/kg/h for ≥12 h |
| 3 | ≥3.0 times baseline OR ≥354 μmol/L OR initiation of RRT | <0.3 mL/kg/h for ≥24 h OR anuria for ≥12 h |
AKI = acute kidney injury; RRT = renal replacement therapy. Adapted with permission.7