GFR Category GFR (ml/min/1.73m2) Terms

G1 ≥ 90 Normal or High
G2 60-89 Mildly decreased*
G3a 45-59 Mildly or moderately decreased
G3b 30-44 Moderately or severely decreased
G4 15-29 Severely decreased
G5 <15 Kidney failure
Abbreviations: CKD: Chronic Kidney Disease; GFR: Glomerular Filtration Rate
*Relative to young adult level
In the absence of evidence of kidney damage, neither GFR category G1 nor G2 fulfill the criteria for CKD Reprinted by Permission from Nature Publishing Group, KDIGO 2012 Clinical Practice Guidelinefor the Evaluation and Management of Chronic Kidney Disease, Kidney International supplement 3: 27, table 5, Copyright (2013)
Table 1: Categories of GFR: addition of G3a and G3b.