Table 3

Classification of AKI		Creatinine/GFR criteria	Urine output criteria
RIFLE classification by the ADQI
Risk	50-100% or GFR decrease >25%		<0.5ml/kg/h for >6h
Injury	50-100% or GFR decrease >50%		<0.5ml/kg/h for >12h
Failure	> 200% or GFR decrease >75%		<0.3ml/kg/h for >24h or anuria for >12h
Loss	Complete loss of kidney function;> 4 weeks dialysis
ESRD	End stage renal disease; >3 months dialysis
Classification system of the AKIN
Stage 1 (risk)		Increase in serum creatinine of ≥0.3 mg /dl within 48 h or any increase ≥1.5 to 2-fold from baseline	<0.5ml/kg/h for >6h
Stage 2 (injury)		Increase in serum creatinine to >2 to 3-fold from baseline	<0.5ml/kg/h for >12h
Stage 3 (failure)		Increase in serum creatinine to >3-fold from baseline or serum creatinine ≥4mg/dl	<0.3ml/kg/h for >24h or anuria for >12h

Table 3: Classification of Acute Kidney Injury (AKI) according to the Acute Dialysis Qualitative Initiative (ADQI) [50] and to the Acute Kidney Injury Network (AKIN) [53].