Table 4. RIFLE, pRIFLE, and nRIFLE criteria for AKI .

	Serum Creatinine (SCr)	Urinary Output and Duration
		RIFLE	pRIFLE	nRIFLE
Risk (R)	SCr X 1.5	< 0.5 mL/kg/h (6 h)	< 0.5 mL/kg/h for (8 h)	< 1.5 mL/kg/h (24 h)
Injury (I)	SCr X 2.0	< 0.5 mL/kg/h (12 h)	< 0.5 mL/kg/h for (16 h)	< 1.0 mL/kg/h (24 h)
Failure (F)	SCr X 3.0 or > 4 or Acute rise > 0.5 mg/dL	< 0.3 mL/kg/h (24 h) OR Anuric (12 h)	< 0.3 mL/kg/h (24 h) OR Anuric (12 h)	< 0.7 mL/kg/h (24 h) OR Anuric (12 h)
Limitation (L)	Loss of kidney function for 4 weeks
End stage (E)	Loss of kidney function > 3 months

Source: Reference 14.