Table 1.

Diagnostic criteria for RIFLE, AKIN and KDIGO. RIFLE, Risk, Injury, Failure, Loss, and End-stage renal failure. AKIN, Acute Kidney Injury Network. KDIGO, Kidney Disease: Improving Global Outcomes. SCr, Serum creatinine. GFR, Glomerular Filtration Rate. RRT, Renal Replacement Therapy.

RIFLE			AKIN			KDIGO
Class	Creatinine Criteria	Urine Output Criteria	Stage	Creatinine Criteria	Urine Output Criteria	Stage	Creatinine Criteria	Urine Output Criteria
Risk	SCr ≥ 1.5 times baseline OR GFR decline ≥ 25%	<0.5 mL/kg/h for ≥6 h	Stage 1	SCr ≥ 1.5 times baseline or increase by 0.3 mg/dL within 48 hours	<0.5 mL/kg/h for ≥6 h	Stage 1	SCr increase by 0.3 mg/dL within 48 hours OR SCr ≥ 1.5–1.9 times baseline within 7 days	<0.5 mL/kg/h for ≥6 h
Injury	SCr ≥ 2 times baseline OR GFR decline ≥ 50%	<0.5 mL/kg/h for ≥12 h	Stage 2	SCr ≥ 2 times baseline	<0.5 mL/kg/h for ≥12 h	Stage 2	SCr ≥ 2.0–2.9 times baseline within 7 days	<0.5 mL/kg/h for ≥12 h
Failure	SCr ≥ 3 times baseline or increase by 0.5 mg/dL to ≥ 4 mg/dL OR GFR decline ≥ 75% OR RRT Initiation	<0.3 mL/kg/h for 24 h OR Anuria for 12 h	Stage 3	SCr ≥ 3 times baseline or increase by 0.5 mg/dL to ≥ 4 mg/dL OR RRT Initiation	<0.3 mL/kg/h for 24 h OR Anuria for 12 h	Stage 3	SCr ≥ 3 times baseline or increase by 0.5 mg/dL to ≥ 4 mg/dL OR RRT Initiation	<0.3 mL/kg/h for 24 h OR Anuria for 12 h
Loss	Loss of renal function for ≥ 4 weeks
End-Stage	Loss of renal function for ≥ 3 months