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eGFR
An estimate of how much blood the kidneys filter each minute, calculated from creatinine together with age and sex. It is an estimate, not a measurement: the equation assumes an average relationship between creatinine and muscle mass, so it is least reliable at the extremes of body composition and in acute illness.
General information only — not a diagnosis, not treatment and not a substitute for your doctor. Reference ranges differ between laboratories, so the range printed on your own report is the one that counts, and only a clinician who knows your history can say what a result means for you. Never start, stop or change a medicine or supplement based on this page.
Usual adult reference range
The ranges below are typical adult reference intervals. Your own laboratory sets its own, printed next to your result, and that is the one to compare against.
| Group | Reference range (mL/min/1.73m²) |
|---|---|
| Normal or high | 90 or above |
| Mildly reduced | 60-89 |
| Reduced — investigated further | below 60 |
Source: Stage boundaries in routine use from chronic kidney disease guidelines; the value is calculated from creatinine by an equation the laboratory names on the report. · checked 2026-09-02
What a high result generally indicates
A high eGFR is generally reported simply as "90 or above" and is not treated as abnormal. Very high filtration can occur in pregnancy and early diabetes, but routine reports do not distinguish it.
What a low result generally indicates
A reduced eGFR means filtration is lower than expected for your age and sex. Chronic kidney disease is defined by a reduction that persists for at least three months, usually together with a urine albumin test — so one low reading is a reason to repeat the test, not a diagnosis. eGFR also guides the dose of many medicines.
These are general patterns, not a diagnosis. Many things cause a high or low result, and the same figure means different things in different people. What yours means is a question for the doctor who ordered the test.
What affects this result
- Everything that affects creatinine affects eGFR, in the opposite direction.
- Age is built into the equation; eGFR declines gradually with age.
- Acute illness and dehydration lower it temporarily.
- Very high or very low muscle mass makes the estimate less accurate.
- Pregnancy raises true filtration, and the usual equations are not validated for it.
- Different equations (CKD-EPI, MDRD) give slightly different numbers.
Before the test
Reported automatically with creatinine; no separate sample is taken.
Any preparation instruction that comes with your test slip overrides this general note — follow the one your clinician or laboratory gave you.
The one thing to take from this page
The range above is a typical interval for orientation. Your own laboratory's range, printed beside your result, is the one that applies to you — and a result is only meaningful alongside your symptoms, your history, your medicines and your other tests. That reading is a clinician's job. This page cannot diagnose anything, cannot tell you to change a medicine or a supplement, and is not a substitute for the person who ordered your test.
Frequently asked questions
What is the normal range for egfr?
A typical adult reference interval is 60 mL/min/1.73m² or above, but laboratories differ — the range printed on your own report is the one to use. And a result inside or outside a range is only meaningful in context, which is your doctor's reading, not a web page's.
What does a high egfr mean?
A high eGFR is generally reported simply as "90 or above" and is not treated as abnormal. Very high filtration can occur in pregnancy and early diabetes, but routine reports do not distinguish it.
What does a low egfr mean?
A reduced eGFR means filtration is lower than expected for your age and sex. Chronic kidney disease is defined by a reduction that persists for at least three months, usually together with a urine albumin test — so one low reading is a reason to repeat the test, not a diagnosis. eGFR also guides the dose of many medicines.
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