Table 2:

RIFLE criteria.

Category	Creatinine/GFR criteria	UO criteria
Risk	Increased serum creatinine ×1.5 or GFR decrease >25%	UO <0.5 mL/kg/h for 6 h
Injury	Increased serum creatinine ×2 or GFR decrease >50%	UO <0.5 mL/kg/h for 12 h
Failure	Increased serum creatinine ×3 or serum creatinine ≥4 mg/dL or GFR decrease >75%	UO <0.3 mL/kg/h for 24 h or anuria for 12 h
Loss	Persistent acute renal failure or complete loss of renal function for >4 weeks
ESKD	ESKD for >3 months

ESKD, end-stage kidney disease; GFR, glomerular filtration rate; UO, urine output.