eGFR Explained
What estimated glomerular filtration rate is, how it is calculated, and its role in staging kidney disease.
Last updated: 2026-09-24
eGFR is the estimated glomerular filtration rate — a calculated estimate of kidney filtering used to detect and stage kidney disease.
How it is calculated
It is derived from serum creatinine together with age and sex. It is an estimate, not a direct measurement.
Why it matters
eGFR stages CKD from 1 to 5 and guides decisions such as when to prepare for dialysis.
Frequently asked questions
What is a normal eGFR?
Usually 90 or above, with a small natural decline with age.