eGFR Calculator
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Understanding Glomerular Filtration Rate
Your kidneys contain millions of tiny filtering units called glomeruli. The Glomerular Filtration Rate (GFR) is the volume of fluid filtered by these glomeruli per minute. An estimated GFR (eGFR) is derived from blood creatinine levels to screen for kidney dysfunction.
The CKD-EPI 2021 Creatinine Equation
The CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) 2021 equation is the current gold standard recommended by the National Kidney Foundation. It calculates eGFR using age, sex, and serum creatinine, removing historical racial variables to ensure equitable healthcare.
Clinical Interpretation of eGFR Ranges
An eGFR of 90 or above represents normal kidney function. Values between 60 and 89 suggest mild reduction (which may be typical in elderly adults). Values below 60 that persist for over 3 months indicate chronic kidney disease (CKD) and require clinical evaluation.
When to Seek Urgent Medical Attention
- Severe shortness of breath, chest pressure, or difficulty lying flat (fluid overload).
- Severe swelling (edema) in the legs, ankles, hands, or face.
- Extreme confusion, lethargy, or seizure activity.
Frequently Asked Questions
Estimated Glomerular Filtration Rate (eGFR) measures how well your kidneys filter waste products from your blood. Standard healthy ranges are above 60 mL/min/1.73m².
The 2021 CKD-EPI equation was developed to provide an accurate estimate of kidney function without relying on race-based correction factors, standardizing kidney care.
