A glomerular filtration rate (GFR) test is a blood test that checks how well your kidneys are working. Your kidneys are two organs on either side of your spine near your waist. They have tiny filters called glomeruli. These filters remove waste and extra water from your blood and gets rid of them through urine.
If your kidneys have been damaged by kidney disease, they can't filter your blood as fast as they should. A GFR test checks for kidney disease by measuring how much blood your kidneys filter each minute.
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GFR can be measured directly, but it is a complicated test to do. So health care providers usually estimate GFR based on the amount of certain waste substances in your blood. An estimated GFR is called an eGFR.
To figure out your eGFR, your provider usually uses the results of a blood test that measures your creatinine level. Creatinine is a waste product that comes from normal wear and tear on your muscles. If your kidneys aren't working well, creatinine can build up in your blood..
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The normal level of GFR is considered at 60 or above
A below 60 GFR test result may indicate kidney-related diseases
A below 15 GFR test results may indicate severe kidney failure
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What does the GFR Test Measure ?
Your eGFR results may be reported as a number that shows how much blood your kidneys filter per minute. An eGFR isn't a perfect test and may not always reflect kidney damage. It's also possible to have an abnormal result even if you don't have kidney damage. Hence a Kidney Function Test is also advised along with GFR test for a better understanding of your kindey health.
Why should I do the GFR Test ?
Early-stage kidney disease doesn't usually cause symptoms, so you may have an eGFR test to check your kidney health as part of a routine exam. You may also need this test if you have a high risk of getting kidney disease. Your risk may be higher if you:
If you are diabetic.
Have high blood pressure.
Have a family health history of kidney disease, diabetes, or high blood pressure
Have Heart Disease
Smoker
Later stage kidney disease does cause symptoms. So, you may need an eGFR test if you have:
Swelling in your legs, feet, ankles, or hands or face
Urinating (peeing) more often or less often than usual
Dry skin and/or itching
Muscle cramps
Loss of appetite
How is the GFR Test Done ?
The GFR test is a simple blood test with no need for fasting before the test. The blood sample can be taken by the phlebotomist at a pathology lab or at home. At Maurya Labs, Purnea the test is done on a Fully Automatic Machine. The sample collection takes less than a minute.
How often should GFR Test be Done ?
GFR Test should be done as per the advise of the doctor. If you are known case of kidney disease then you may check with your doctor the set of tests that need to be done frequently. At Maurya Labs we have special packages for kidney diseases which should be good enough for your routine check up.
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