Estimated Glomerular Filtration Rate Calculator
The Estimated Glomerular Filtration Rate (eGFR) Calculator is a quick and reliable way to assess kidney function. eGFR is a critical measurement used by doctors to evaluate how well your kidneys filter waste from your blood.
This tool helps you estimate your eGFR value, CKD stage, and overall kidney function based on age, gender, serum creatinine, and race.
What is eGFR?
The glomerular filtration rate (GFR) measures how well your kidneys filter blood. Since direct GFR testing is complex, the eGFR formula uses serum creatinine, age, gender, and race to estimate kidney function.
eGFR is expressed in mL/min/1.73m² and helps identify early kidney disease before symptoms appear.
Why eGFR is Important
Monitoring eGFR can:
- Detect chronic kidney disease (CKD) early
- Track kidney function over time
- Guide medication dosage adjustments
- Help prevent complications like high blood pressure or anemia
- Assist doctors in planning treatment for kidney-related conditions
How the eGFR Calculator Works
This calculator uses the CKD-EPI formula, which is widely accepted for estimating kidney function:
- Input age, gender, serum creatinine, and race
- The calculator adjusts for gender and race multipliers
- It computes your eGFR value
- Provides your CKD stage, kidney function level, and a simple interpretation
All results appear instantly for easy understanding.
How to Use the eGFR Calculator
Step 1: Enter Your Age
Provide your age in years (1–120).
Step 2: Select Your Gender
Choose male or female for accurate calculations.
Step 3: Enter Serum Creatinine
Input your most recent serum creatinine level (mg/dL).
Step 4: Select Your Race
Select African American or Non-African American.
Step 5: Click “Calculate”
Your eGFR, CKD stage, kidney function, and interpretation will appear instantly.
Understanding the Results
- eGFR Value (mL/min/1.73m²): Higher values indicate better kidney function.
- CKD Stage: Ranges from Stage 1 (normal) to Stage 5 (kidney failure).
- Kidney Function: Describes kidney health from normal to severely decreased.
- Interpretation: Simple explanation of what your eGFR means for your health.
CKD Stages by eGFR
| eGFR (mL/min/1.73m²) | CKD Stage | Kidney Function | Interpretation |
|---|---|---|---|
| ≥ 90 | 1 | Normal/High | Normal kidney function |
| 60–89 | 2 | Mildly Decreased | Mild loss of kidney function |
| 45–59 | 3a | Mild to Moderate | Mild to moderate loss |
| 30–44 | 3b | Moderate to Severe | Moderate to severe loss |
| 15–29 | 4 | Severely Decreased | Severe loss of kidney function |
| < 15 | 5 | Kidney Failure | Kidney failure, dialysis may be needed |
Who Should Use This eGFR Calculator?
- People at risk of chronic kidney disease
- Those with diabetes, high blood pressure, or heart disease
- Individuals monitoring kidney function after medication use
- Anyone curious about their kidney health
Tips for Accurate Results
- Use the most recent lab values for creatinine
- Ensure correct age, gender, and race are entered
- Remember this tool does not replace professional medical advice
- Discuss abnormal results with a qualified healthcare provider
Frequently Asked Questions (FAQs)
1. Is eGFR the same as kidney function?
eGFR estimates kidney function but may not detect all kidney problems.
2. Can eGFR change over time?
Yes, kidney function can improve or decline due to health changes.
3. Does diet affect eGFR?
Certain diets, hydration, and medications can temporarily affect serum creatinine and eGFR.
4. Can children use this calculator?
This calculator is primarily for adults; pediatric eGFR formulas differ.
5. Should I be worried about low eGFR?
A low eGFR should be discussed with your doctor for further testing.
6. Is race necessary in the calculation?
Race is included to improve accuracy in eGFR estimation according to CKD-EPI guidelines.
7. How often should I check eGFR?
Frequency depends on health status; consult your physician.
8. Can medications affect eGFR?
Yes, certain drugs can temporarily or permanently affect kidney function.
9. Is eGFR the only kidney test I need?
No, doctors may also order urine tests, imaging, or other lab tests.
10. Can I use this if I have a kidney transplant?
This calculator may not be accurate for transplant patients.
Final Thoughts
The Estimated Glomerular Filtration Rate (eGFR) Calculator is a simple yet powerful tool to monitor kidney health. By providing a quick estimate of kidney function and CKD stage, it helps you and your healthcare provider make informed decisions.
Check your eGFR regularly, especially if you are at risk of kidney disease, to maintain healthy kidney function over time. 🩺💚