eGFR Test
Category
Nephrology
Specimen
Calculated (blood)
Organ System
—
Available At
0 labs
About eGFR Test
eGFR, or estimated Glomerular Filtration Rate, is a calculated value — derived from your blood creatinine level, age, and sex — that estimates how much blood your kidneys are filtering each minute, expressed relative to a standard body surface area.
Rather than measuring a raw chemical level like most blood tests, eGFR translates that information into a more intuitive, clinically meaningful percentage of expected normal kidney function, making it easier for both doctors and patients to understand kidney health at a glance.
eGFR forms the backbone of how chronic kidney disease is staged, with specific eGFR thresholds defining each stage from mild reduction in function through to kidney failure requiring dialysis or transplant.
Because it's calculated rather than directly measured, eGFR automatically appears on most standard kidney function test reports whenever creatinine, age, and sex are available, without requiring a separate blood draw.
When Should You Get eGFR Test
eGFR is used to:
- Screen for chronic kidney disease, especially in people with diabetes or high blood pressure
- Stage the severity of known kidney disease
- Monitor kidney function over time in at-risk patients
- Guide dosing decisions for medications that are cleared by the kidneys
Conditions eGFR Test Can Detect
eGFR is used to classify and monitor:
- Chronic kidney disease, staged from mild reduction to kidney failure
- Acute kidney injury, when tracked over short intervals
- Age-related decline in kidney function
- Diabetic and hypertensive kidney damage
How to Prepare for eGFR Test
- No separate preparation is needed beyond what's required for the creatinine blood test it's calculated from.
- Providing your accurate age and confirming your sex with the lab ensures the eGFR calculation is as accurate as possible.
eGFR Test Normal Reference Ranges
| Parameter | Normal Range |
|---|---|
| Normal | 90 or above (mL/min/1.73m²) |
| Mildly Reduced | 60–89 |
| Moderately Reduced | 30–59 |
| Severely Reduced | 15–29 |
| Kidney Failure | Below 15 |
eGFR naturally declines somewhat with age even in healthy people, so your doctor interprets your result in the context of your age, trend over time, and other kidney health markers like urine protein, rather than a single number in isolation.
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Frequently Asked Questions About eGFR Test
Is a lower eGFR always a sign of disease?
Not necessarily — eGFR naturally declines somewhat with normal aging, so your doctor considers your age, other kidney markers, and the trend over repeated tests rather than treating one borderline result as definitive.
How is eGFR used to stage kidney disease?
Chronic kidney disease is classified into five stages based on eGFR ranges, with lower values indicating more advanced disease and guiding decisions about monitoring frequency and treatment.
Can eGFR improve over time?
In cases of acute kidney injury from a reversible cause like dehydration or a short-term illness, eGFR can improve significantly once the underlying issue resolves; chronic kidney disease is more often managed to slow further decline.
Medical Disclaimer: This page is for informational purposes only and does not constitute medical advice. Lab test results should always be interpreted by a qualified healthcare professional in the context of your clinical history. Do not self-diagnose or alter your treatment based on test results alone.
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