From: Performance of Cockcroft-Gault, MDRD, and CKD-EPI in estimating prevalence of renal function and predicting survival in the oldest old
GFR
CKD stage
Description
≥ 60
Stage 1 and 2
Kidney damage with normal or mildly decreased GFR
45–59
Stage 3a
Moderately decreased GFR
30–44
Stage 3b
< 30
Stage 4 and 5
Severely decreased GFR or kidney failure