The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood. Next, the health care provider gently inserts a needle into the vein. The blood collects into a small glass tube called a pipette, or onto a slide or test strip.
A bandage may be placed over the area if there is any bleeding. The blood sample is sent to a lab, where the creatinine level is tested. The lab specialist uses combines your creatinine level with several other factors to estimate your glomerular filtration rate (GFR).

Tell your doctor about all medicines you are taking, including over-the-counter ones. How the Test Will Feel When the needle is inserted to draw blood, some people feel moderate pain, while others feel only a prick or stinging sensation. Afterward, there might be some throbbing. Why the Test is Performed The GFR test measures how well your kidneys are filtering a waste called creatinine, which is produced by the muscles. When the kidneys aren't working as well as they should, creatinine builds up in the blood. Your doctor may order this test if there are signs that your kidneys are not working properly. Older people will have lower normal GFR levels, because GFR decreases with age. Normal value ranges can vary slightly among different laboratories.

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