Nephrology

KDIGO AKI Staging Criteria

Stages Acute Kidney Injury (AKI) based on serum creatinine changes.

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Parameters

KDIGO AKI Staging Criteria Result

Formula

Stage 1: 1.5-1.9× baseline OR ≥0.3 mg/dL increase.
Stage 2: 2.0-2.9× baseline.
Stage 3: ≥3.0× baseline OR Cr ≥4.0 mg/dL (with ≥0.3 rise) OR new dialysis.

Clinical Pearls

Standardizes AKI diagnosis and prognostic risk across all clinical settings. Higher stages correlate directly with increased hospital mortality and long-term risk of CKD.

Limitations

Does not account for the urine output criteria of KDIGO (e.g. <0.5 mL/kg/h for 6h). Assumes baseline creatinine accurately reflects steady-state premorbid renal function.