Table 3. KDIGO classification criteria for acute kidney injury.

Stage	Serum creatinine (Scr)	Urine output (UO)
1	Baseline increase of 1.5 to 2 times in 7 days	<0.5 mL/kg/hour for 6–12 hours
2	Baseline increase of 2 to 3 times	<0.5 mL/kg/hour for ≥12 hours
3	≥4 mg/dL or a baseline increase >3 times or initiation of renal replacement therapy	<0.3 mL/kg/hour for ≥24 hours or anuria for ≥12 hours

Abbreviation: KDIGO: Kidney Disease Improving Global Outcomes.