Table 1.

Glomerular filtration rate (GFR) categories in chronic kidney disease (CKD). Patients with CKD G1 and G2 have normal eGFR value and have other evidence of kidney damages (e.g. proteinuria)

GFR category	GFR (mL/min/1.73 m^2)	Terms
G1	≥90	Normal or high, with evidence of kidney damage
G2	60–89	Mildly decreased, with evidence of kidney damage
G3a	45–59	Mildly to moderately decreased
G3b	30–44	Moderately to severely decreased
G4	15–29	Severely decreased
G5	< 15	Kidney failure

CKD Chronic kidney disease, G Grade, GFR Glomerular filtration rate, eGFR Estimated glomerular filtration rate