| Stage | Description | GFR (mL/min/1.73 m2) |
| 1 | Kidney damage with normal or elevated GFR | ≤90 |
| 2 | Kidney damage with mildly decreased GFR | 60-89 |
| 3 | Moderately decreased GFR | 30-59 |
| 4 | Severely decreased GFR | 15-29 |
| 5 | Kidney failure (end-stage renal disease) | <15 |
| (or dialysis/transplant) | ||
| GFR : glamerular filtration rate | ||