eGFR (Kidney Function)
eGFR (estimated Glomerular Filtration Rate) estimates how well your kidneys filter waste from your blood. It's calculated from a creatinine blood test plus your age and sex — not measured directly.
Your reading
90 and above is considered normal, with no meaningful upper ceiling — a healthy kidney doesn't have a "too good" filtration rate. There's no such thing as an eGFR that's abnormally high; if you see a number well above 90, that's not a concern on its own.
What may help
- —Staying well-hydrated and managing blood pressure — chronically high blood pressure is one of the most common causes of declining kidney function over time
- —Limiting NSAID painkillers (ibuprofen, naproxen) if used frequently, since they can stress the kidneys
- —Managing blood sugar if you have diabetes — diabetes is the other leading cause of kidney decline
When to talk to a doctor
If your eGFR is below 60, especially on more than one test — that's the threshold clinicians use to start investigating chronic kidney disease.
Source: MedlinePlus (NIH). Reference ranges are standard adult intervals — your own lab may report a different range for your age, sex, or method. This isn't medical advice; always go by the range on your actual results and talk to a clinician about anything that concerns you.