Table 1:

Definitions of chronic kidney disease according to glomerular filtration rate by the Kidney Disease Outcomes Quality Initiative of the US National Kidney Foundation

Stage	Description	GFR (mL/min/1.73 m2)
1	Kidney damage with normal or elevated GFR	≥ 90
2	Kidney damage with mild decrease in GFR	60–89
3*	Moderate decrease in GFR	30–59
4	Severe decrease in GFR	15–29
5	Kidney failure	< 15 (or dialysis)

Note: GFR = glomerular filtration rate.

^*Modified in 2014 to distinguish stage 3a, defined by GFR between 45 mL/min/1.73 m² and 59 mL/min/1.73 m², from stage 3b, defined by GFR between 30 and 44 mL/min/1.73m².