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Table 1 RIFLE criteria for the definition of acute kidney injury (urinary output criteria not listed)

From: RIFLE is not RIFLE: on the comparability of results

RIFLE class RIFLE criteria
R (risk) ≥ 1.5-fold increase in serum creatinine, or >25% decrease in GFR
I (injury) ≥ 2-fold increase in serum creatinine, or >50% decrease in GFR
F (failure) ≥ 3-fold increase in serum creatinine, or >75% decrease in GFR