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.