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KDIGO AKI Classification

Stage Serum Creatinine Urine Output
1 1.5 - 1.9 ✕ baseline
or
increase ≥ 0.3 mg/dL
(≥ 26.5 µmol/L)
< 0.5 mL/kg/h ✕ 6 - 12 h
2 2 – 2.9 ✕ baseline < 0.5 mL/kg/h ✕ 12 - 24 h
3 3 ✕ baseline
or
increase to ≥ 4.0 mg/dL
(≥ 350 µmol/L)
or
initiation of renal replacement therapy
or
for patients < 18 years, eGFR
decrease to
< 35 mL/min/1.73 m²
< 0.3 mL/kg/h ✕ 24 h
or
anuria ✕ 12 h
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