Table 1.

Overview of the RIFLE criteria [9]

	GFR criteria	Urinary output (UO) criteria
R(isk)	Increased serum creatinine × 1.5 or GFR decrease > 25%	UO < 0.5 mL/kg/u × 6 h
I(njury)	increased serum creatinine × 2 or GFR decrease > 50%	UO < 0.5 mL/kg/u × 12 h
F(ailure)	increased serum creatinine × 3, GFR decrease 75% or serum creatinine ≥ 4 mg/dL	UO < 0.3 mL/kg/u × 24 h or anuria × 12 h
L(oss)	Persistent ARF = complete loss of kidney function > 4 weeks
E(nd-stage kidney failure)	End stage kidney disease

ARF, acute renal failure; GFR, glomerular filtration rate.