What the test is
eGFR is reported as part of most basic and comprehensive metabolic panels.
Muscle mass, dehydration, and some supplements (like creatine) can affect creatinine. A cystatin C test can help confirm.
Why it's done
- Checking kidney function in diabetes, high blood pressure, or heart disease
- Before and during medicines that affect the kidneys
- Swelling, changes in peeing, or other kidney symptoms
Getting ready and what happens
- Avoid heavy exercise and large amounts of meat the day before, if your provider asks.
How the test is done
- A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.
What the results mean
| Result | Typical range for adults |
|---|---|
| eGFR | 90 or higher is normal; 60 to 89 is mildly reduced (may be normal with age) |
| Chronic kidney disease | eGFR below 60 for 3 months or more |
| Kidney failure | eGFR below 15 |
Normal ranges vary from lab to lab and can differ by age, sex, and pregnancy. Your report lists your lab's own range next to each result. A result a little outside the range is often not a problem.
Low eGFR
May mean kidney disease, dehydration, or a medicine effect. A single low result is usually repeated. A urine albumin test helps stage kidney disease.
Sudden rise in creatinine
Can be acute kidney injury from dehydration, infection, blockage, or medicines and needs prompt attention.
When a result needs quick action
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
- Do I have kidney disease, and what stage?
- Do any of my medicines need a dose change?
- Should I avoid NSAIDs like ibuprofen?
Risks
A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.
Related conditions
Related medicines
Related tests
Sources
Last updated 2026-11-13.