Table 2.

Stages of chronic kidney disease

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

Note: Data from Block et al.30

Abbreviation: GFR, glomerular filtration rate.