CKD Stage	Description	GFR	% of kidney function
1	Kidney damage with normal kidney function	90 or higher	90-100%
2	Kidney damage with mild loss of kidney function	60-89	60-89
3a	Mild to moderate loss of kidney function	45-59	45-59
3b	Moderate to severe loss of kidney function	30-44	30-44
4	Severe loss of kidney function	15-29	15-29
5	Kidney failure	<15	<15