Table 1.

The RIFLE classification

	GFR criteria	Urine output criteria
Risk	SCr increased 1.5 times	0.5 ml(kg h) for 6 h
Injury	SCr increased 2.0 times	0.5 ml(kg h) for 12 h
Failure	SCr increased 3.0 times or creatinine = 355 μmol/l when there was an acute rise of >44 μmol/l	0.3 ml(kg h) for 24 h or anuria for 12 h
Loss	Persistent ARF; complete loss of kidney function for >4 weeks
End-stage renal disease	End-stage renal disease for >3 months