NephrologyScore

KDIGO AKI Staging — Acute Kidney Injury Classification

The KDIGO (Kidney Disease: Improving Global Outcomes) 2012 staging system classifies acute kidney injury (AKI) into three stages based on serum creatinine changes and/or urine output. AKI is defined as any of: increase in serum creatinine ≥ 0.3 mg/dL within 48 hours; increase to ≥ 1.5× baseline within 7 days; or urine output < 0.5 mL/kg/h for ≥ 6 hours. Staging guides management intensity, nephrology consultation, and renal replacement therapy (RRT) decisions.

Parameters

AKI Stage — Highest Criterion Met (Creatinine or Urine Output)

No AKI — Creatinine criteria not met AND urine output adequate+0Stage 1 — SCr 1.5–1.9× baseline OR increase ≥ 0.3 mg/dL within 48h; OR UO < 0.5 mL/kg/h for 6–12h+1Stage 2 — SCr 2.0–2.9× baseline; OR UO < 0.5 mL/kg/h for ≥ 12h+2Stage 3 — SCr ≥ 3× baseline OR ≥ 4.0 mg/dL OR RRT initiated; OR UO < 0.3 mL/kg/h for ≥ 24h, or anuria ≥ 12h+3

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NephrologyScore

KDIGO AKI Staging — Acute Kidney Injury Classification

The KDIGO (Kidney Disease: Improving Global Outcomes) 2012 staging system classifies acute kidney injury (AKI) into three stages based on serum creatinine changes and/or urine output. AKI is defined as any of: increase in serum creatinine ≥ 0.3 mg/dL within 48 hours; increase to ≥ 1.5× baseline within 7 days; or urine output < 0.5 mL/kg/h for ≥ 6 hours. Staging guides management intensity, nephrology consultation, and renal replacement therapy (RRT) decisions.

Parameters

AKI Stage — Highest Criterion Met (Creatinine or Urine Output)

No AKI — Creatinine criteria not met AND urine output adequate+0Stage 1 — SCr 1.5–1.9× baseline OR increase ≥ 0.3 mg/dL within 48h; OR UO < 0.5 mL/kg/h for 6–12h+1Stage 2 — SCr 2.0–2.9× baseline; OR UO < 0.5 mL/kg/h for ≥ 12h+2Stage 3 — SCr ≥ 3× baseline OR ≥ 4.0 mg/dL OR RRT initiated; OR UO < 0.3 mL/kg/h for ≥ 24h, or anuria ≥ 12h+3

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