GFR Information & Calculator

Your kidneys filter your blood and help control blood pressure. They remove wastes and water and make urine.

Your doctor can check how healthy your kidneys are. Part of that process is a blood test that measures how much blood they are filtering. This test is called eGFR (estimated glomerular filtration rate).

It is important to know your eGFR because you may not be able to feel if your kidneys have been damaged. Checking your eGFR is the best way to tell how your kidneys are working.

GFR Calculator

How can I get my eGFR?

Your doctor will test your blood for creatinine. Creatinine is a waste that comes from your muscles. Your doctor will use your creatinine result, your age, your sex and your race to figure out your eGFR. Creatinine may vary from day to day. For the best results, you might need your eGFR tested again in a few months.

Is this a test everyone should take? 

This test is NOT for you if you are:

•younger than 18 years old
•over 70 years old
•extremely obese
•extremely muscular
•pregnant
•have another serious illness

If any of these describe you, talk to your doctor about other tests.
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What your eGFR Result may mean:

30 to 59  -- Moderate Kidney Damage
15 to 29  -- Severe Kidney Damage
Less than 15  -- Kidney Failure (Dialysis or transplant may be needed soon.)

*If your eGFR was 60 or higher

Your doctor will look at other factors to make sure you do not have early-stage kidney disease.

These include:
• Your urine (for protein or blood)
• Your health history
• Your blood (for wastes and toxins)
• Your family’s health history
• Your blood pressure

Protect your kidneys by eating nutritious food, staying active and seeing your doctor regularly.