What Is An eFGR Test?
The estimated glomerular filtration rate (eGFR) test assesses kidney function by estimating how well your kidneys filter waste from the blood. The test calculates the filtration rate based on factors such as your serum creatinine levels, age, sex and race.
It is a critical diagnostic tool for identifying early stages of chronic kidney disease (CKD), monitoring disease progression and evaluating overall kidney health. Doctors commonly recommend the eGFR test for individuals at risk of kidney problems, such as those with diabetes, hypertension or a family history of kidney disease.
Timely detection through eGFR can help prevent kidney failure and reduce the risk of complications like heart disease and electrolyte imbalances.
How is the Test Performed?
The eFGR test is conducted through a blood sample:
Sample Collection
A healthcare professional draws blood from a vein in your arm.
Lab Analysis
The blood sample is analyzed to measure creatinine levels. Creatinine is a waste product generated by muscle metabolism and filtered by the kidneys.
Result Calculation
The eGFR is calculated using a specific formula that considers creatinine levels, age, sex and sometimes race. The test is non-invasive, quick and results are typically available within a day.
What are the symptoms that prompt this test?
Common symptoms that prompt this test are:
Adults & Elderly
- Swelling in the hands, feet, or face
- Persistent fatigue or weakness
- Changes in urine color, frequency or amount
- Shortness of breath
- Loss of appetite or nausea
Children
- Poor growth or weight gain
- Blood in urine
- Unexplained swelling
- Frequent bedwetting or urination
What are Normal Ranges for This Test?
eGFR ≥90 mL/min/1.73m² is considered normal.
Results below 60 mL/min/1.73m² may indicate kidney dysfunction.
Values below 15 suggest kidney failure.
**The above-given reference value is for general guidelines only and should not be considered as a diagnosis. Your healthcare provider will give you the correct interpretation of the results. **
What Happens if Test Results Show Abnormal Levels?
Abnormal eGFR results indicate reduced kidney function and may require further evaluation:
Additional Tests – Urinalysis, kidney ultrasound or biopsy to determine the cause of kidney dysfunction.
Management – The doctor may recommend lifestyle changes, medications or treatment for underlying conditions like diabetes or hypertension.
Referral – In severe cases, referral to a nephrologist for specialized care might be necessary.
Early intervention can slow disease progression and improve outcomes.
