This test estimates how efficiently the kidneys filter waste products from the blood.
Diagnostic Value: Low eGFR values indicate impaired kidney function or early chronic kidney disease (CKD), even when symptoms are not yet apparent.
Clinical Significance: eGFR is one of the most reliable measures for staging CKD and tracking disease progression or treatment response.
Symptom Correlation: Patients with declining eGFR may experience fatigue, swelling, nausea, or changes in urination patterns.
Because it quantifies kidney performance directly, eGFR is central to evaluating renal health and preventing progression to advanced kidney failure.