A safe Glomerular Filtration Rate (GFR) level is generally considered to be 90 mL/min/1.73 m² or higher in adults. This indicates that the kidneys are functioning well. However, GFR naturally declines with age.
Here's a breakdown of GFR ranges and their implications:
- 90 or higher: Normal kidney function.
- 60-89: Mildly decreased kidney function. May not be a cause for concern, especially in older adults, but should be monitored.
- 30-59: Moderately decreased kidney function. Requires evaluation and management.
- 15-29: Severely decreased kidney function. Requires evaluation by a nephrologist and preparation for potential kidney replacement therapy (dialysis or kidney transplant).
- Less than 15: Kidney failure. Requires kidney replacement therapy (dialysis or kidney transplant).
GFR and Age
It's important to note that GFR tends to decline with age even in individuals without kidney disease. This means that what is considered a "safe" GFR can vary somewhat depending on age. The National Kidney Foundation provides information on GFR and its interpretation.
| Age Group | Average eGFR (mL/min/1.73 m²) |
|---|---|
| 20-29 | 116 |
| 30-39 | 107 |
| 40-49 | 99 |
| 50-59 | 91 |
| 60-69 | 85 |
| 70+ | Varies considerably; further evaluation needed |
Important Considerations:
- Trends are Important: A single GFR measurement is less informative than tracking GFR over time. A declining GFR, even if it's still within the "normal" range for age, could indicate a developing kidney problem.
- Individual Variation: GFR can vary depending on several factors, including race, sex, and body size.
- Underlying Conditions: Certain medical conditions, such as diabetes and high blood pressure, can affect GFR.
- Consult a Healthcare Professional: If you are concerned about your GFR, it is best to discuss it with your doctor.
In summary, a GFR of 90 or higher generally indicates healthy kidney function, but interpretation should consider age and other individual health factors. Regular monitoring and consultation with a healthcare professional are crucial for maintaining kidney health.
