| Stage | Stages of Chronic Kidney Disease | GFR | % of Kidney Function |
| 1 | Kidney damage with normal kidney function | 90% or higher | 90-100% |
| 2 | Kidney damage with mild loss of kidney function | 60-89% | 60-89% |
| 3a | Mild to moderate loss of kidney function | 45-59% | 45-59% |
| 3b | Moderate to severe loss of kidney function | 30-44% | 30-44% |
| 4 | Severe loss of kidney function | 15-29% | 15-29% |
| 5 | Kidney failure | <15% | <15% |