Stage	Change in serum creatinine level	Urine output	Other
1	Increase ≥ 0.3 mg per dL (26.52 μmol per L) or ≥ 1.5- to twofold from baseline	< 0.5 mL per kg per hour for more than six hours	—
2	Increase > two- to threefold from baseline	< 0.5 mL per kg per hour for more than 12 hours	—
3	Increase > threefold from baseline or ≥ 4.0 mg per dL (353.60 μmol per L) with an acute rise of at least 0.5 mg per dL (44.20 μmol per L)	< 0.3 mL per kg per hour for 24 hours or anuria for 12 hours	Renal replacement therapy required