1.5–1.9 times baseline OR ≥0.3 mg/dL (>26.5 μmol/L) in ≤48 hours
<0.5 mL/kg/h for 6–12 hours
2
2–2.9 times baseline
<0.5 mL/kg/h for ≥12 hours
3
≥3 times baseline OR increase in SCr to ≥4.0 mg/dL (353.6 μmol/L) OR initiation of RRT
<0.3 mL/kg/h for ≥24 hours OR anuria for ≥12 hours
Abbreviations: GFR: glomerular filtration rate; RRT: renal replacement therapy; SCr: serum creatinine. Only one criterion needs to be met to be classified as AKI; if both are present, the criterion which places the patient in the higher stage of AKI is selected.