eGFR (Estimated Glomerular Filtration Rate) Calculator
Estimates kidney function using the simplified MDRD equation based on serum creatinine and age.
Estimates kidney function using the simplified MDRD equation based on serum creatinine and age. Enter your Serum Creatinine, Age to get an instant estimated gfr. Formula: 175 * pow(serum_creatinine, -1.154) * pow(age, -0.203).
Estimated GFR
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How It Works
How It Works
This calculator estimates your kidney function using a formula called the simplified MDRD equation. It uses two numbers: your serum creatinine level (from a blood test) and your age. Creatinine is a waste product in your blood, and healthy kidneys remove it efficiently.
The formula applies specific mathematical powers to your creatinine level and age, then multiplies them by a constant number (175). This produces a single value that estimates how well your kidneys are filtering blood.
- Higher creatinine usually lowers the eGFR result
- Older age slightly lowers the eGFR result
- The formula adjusts both values using mathematical exponents
- The final number estimates kidney filtering capacity
Understanding the Results
The result is shown as Estimated GFR in mL/min/1.73m². This number represents how much blood your kidneys filter each minute, adjusted to an average body size.
Higher values generally indicate better kidney function, while lower values may suggest reduced kidney performance. Your healthcare provider uses this number along with other tests to assess kidney health.
- 90 or above is typically considered normal
- 60–89 may indicate mildly reduced function
- Below 60 may suggest chronic kidney disease
- Trends over time are more important than a single result
Frequently Asked Questions
What does the eGFR calculator measure?
The eGFR calculator estimates how well your kidneys are filtering waste from your blood. It uses the simplified MDRD equation based on your serum creatinine level and age. The result is expressed in mL/min/1.73m², which reflects kidney filtration efficiency adjusted for body surface area.
When should I use this eGFR calculator?
You can use this calculator if you have a recent serum creatinine blood test result and want to estimate your kidney function. It is commonly used for routine health monitoring or when evaluating potential kidney disease. Always consult a healthcare professional for proper interpretation of the results.
What is serum creatinine and why is it important?
Serum creatinine is a waste product in your blood that comes from normal muscle activity. Healthy kidneys filter creatinine out of the bloodstream efficiently. Higher creatinine levels may indicate reduced kidney function, which is why it is a key input in the eGFR calculation.
How does age affect the eGFR result?
Age is included in the formula because kidney function naturally declines over time. As age increases, the estimated GFR typically decreases even if creatinine levels remain the same. This adjustment helps provide a more accurate estimate of kidney performance.
What is considered a normal eGFR value?
An eGFR of 90 mL/min/1.73m² or higher is generally considered normal in healthy adults. Values between 60 and 89 may indicate mildly reduced kidney function, while values below 60 for three months or more can suggest chronic kidney disease. Interpretation should always be done by a healthcare provider.
Is this calculator suitable for everyone?
This calculator uses the simplified MDRD equation and may not be accurate for certain groups, such as pregnant women, individuals with very high or low muscle mass, or children. It is designed for adults with stable kidney function. For special cases, a healthcare provider may use a different estimation method.
Disclaimer
This health calculator is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Disclaimer.