Stages of chronic kidney disease (CKD)

Stage

GFR 

(mL/min/1.73 m²)

Mnemonic

KDIGO
stage

Description

Stage 1

≥ 90

≥ 90

G1

Normal / High GFR

Stage 2

60-89

≥ 60

G2

Mildly reduced GFR

Stage 3a

45-59

≥ 45

G3a

Mildly to moderately

reduced GFR

Stage 3b

30-44

≥ 30

G3b

Moderately to severely
reduced GFR

Stage 4

15-29

≥ 15

G4

Severely reduced GFR

Stage 5

< 15

< 15 

G5

Kidney failure / End-stage
renal disease (ESRD)