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Table 1 The KDIGO staging system for AKI

From: Causal risk factor discovery for severe acute kidney injury using electronic health records

AKI Stage Serum Creatinine (SCr) Criteria
1 Increase > 26.4 μmol/L (0.3 mg/dL) or 1.5–1.9 times baseline
2 Increase 2.0–2.9 times baseline
3 Increase creatinine > 354 μmol/L (4.0 mg/dL) or 3 times baseline