Exploration of Digestive Diseases

AKI stage	Definition
1	Increase of serum creatinine ≥ 0.3 mg/dL or up to 2-fold from baseline
2	Increase in serum creatinine between 2-fold and 3-fold from baseline
3	Increase in serum creatinine > 4 mg/dL (353.6 µmol/L) with an acute increase ≥ 0.3 mg/dL (26.5 µmol/L) or > 3-fold from baseline or serum creatinine or initiation of renal replacement therapy

AKI stage

Definition

Increase of serum creatinine ≥ 0.3 mg/dL or up to 2-fold from baseline

Increase in serum creatinine between 2-fold and 3-fold from baseline

Increase in serum creatinine > 4 mg/dL (353.6 µmol/L) with an acute increase ≥ 0.3 mg/dL (26.5 µmol/L) or > 3-fold from baseline or serum creatinine or initiation of renal replacement therapy