Table 1 Definitions of AKI
From: Optimising the timing of renal replacement therapy in acute kidney injury
Kidney disease: improving global outcomes (KDIGO) guideline [7] | Acute dialysis quality initiative (ADQI) group [8] | ||||
|---|---|---|---|---|---|
Staging | Serum creatinine criteria | Urine output criteria | Staging | Serum creatinine criteria | Urine output criteria |
1 | 1.5–1.9 times baseline OR Increase ≥ 0.3 mg/dL |  < 0.5 ml/kg/h for 6–12 h | Risk | Increased × 1.5 |  < 0.5 ml/kg/h for 6 h |
2 | 2.0–2.9 times reference value |  < 0.5 ml/kg/h for ≧12 h | Injury | Increased × 2 |  < 0.5 ml/kg/h for ≧12 h |
3 |  > 3.0 times baseline OR Increase to ≧4 mg/dL OR Initiation of renal replacement therapy |  < 0.3 ml/kg/h for ≧24 h | Failure | Increased × 3 OR Increase to ≧4 mg/dL (Acute rise ≧0.5 mg/dL) |  < 0.3 ml/kg/h for 24 h OR Anuria for 12 h |