Kidney
Low eGFR: What It Means for Your Kidneys
eGFR — estimated glomerular filtration rate — is not measured directly. It is calculated from your creatinine along with your age and sex, and it estimates how much blood your kidneys filter each minute. Creatinine tells you the raw number; eGFR turns it into the figure doctors actually stage kidney disease with.
Normal eGFR range
What a high eGFR means
A high eGFR is rarely a concern in itself. Very high values are sometimes seen in early diabetes, when the kidneys are working harder than normal, and low muscle mass can also make the estimate read higher than the kidneys are truly performing. Most labs simply report anything above 90 as normal without a precise figure.
Common causes:
- Normal, healthy kidney function
- Early diabetes, when filtration temporarily increases
- Low muscle mass, which lowers creatinine and so raises the estimate
What a low eGFR means
A low eGFR means the kidneys are filtering more slowly than expected for your age and sex. A single low reading is not a diagnosis — dehydration, a recent illness, or some medicines can push it down temporarily — which is why the definition of chronic kidney disease requires the change to persist across three months.
- Diabetes
- Long-standing high blood pressure
- Dehydration or an acute illness
- Painkillers taken regularly, particularly NSAIDs
- Obstruction, stones or repeated urinary infections
Food & lifestyle that help
Favour
- Plenty of water through the day, unless your doctor has restricted fluids
- Vegetables, fruit and whole grains
- Home-cooked food where you control the salt
Limit
- Salt, pickles, papad and packaged snacks
- Painkillers taken habitually without advice
- Very high protein intake, unless a doctor has advised it
When to see a doctor
Show any eGFR below 60 to a doctor, and treat a falling trend across reports as worth asking about even while the number is still normal. Diabetes or high blood pressure alongside a low eGFR makes that conversation more urgent, not less.
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Make my free plan →Frequently asked questions
What is a normal eGFR by age?
Above 90 is generally normal, and a gentle decline with age is expected rather than alarming. What matters more than a single figure is whether your value is stable across reports or falling.
Can a low eGFR go back up?
Sometimes. When the cause is temporary — dehydration, an infection, a medicine — it often recovers once that is dealt with. Damage that has built up over years is usually about slowing further decline, which is why controlling blood sugar and blood pressure matters so much.
Why is my eGFR low when my creatinine is normal?
Because eGFR accounts for your age and sex as well as creatinine. The same creatinine means something different at 65 than at 35, which is exactly the adjustment eGFR exists to make.