Table 2.

Chronic Kidney Disease Staging System for Patients With Renal Disease (Stage I—IV)

STAGE	DESCRIPTION	KIDNEY FUNCTIONa
I	Kidney damage with normal or increasing GFR	90 or higher
II	Kidney damage with mild decreasing GFR	60–89
T	For transplant
III	Moderate decreasing GFR	30–59
IV	Severe decreasing GFR	15–29
V	Kidney failure	Less than 15 (or dialysis)
D	For dialysis

^aGFR ml per minute per 173 m²

GFR—glomerular filtration rate

Note. T for transplant represents all kidney transplant recipients; D for dialysis is at stage V for people being treated with dialysis.

Note. From “About Chronic Kidney Disease,” by the National Kidney Foundation, 2011. Retrieved from http://www.kidney.org/professionals/KLS/aboutCKD.cfm. Copyright 2011 by the National Kidney Foundation. Reprinted with permission.