What happens during an MTHFR mutation test?A health care professional will take a blood sample from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a little sting when the needle goes in or out. This usually takes less than five minutes.For a newborn screening, a health care professional will clean your baby's heel with alcohol and poke the heel with a small needle. He or she will collect a few drops of blood and put a bandage on the site.Testing is most often done when a baby is 1 to 2 days old, usually in the hospital where he or she was born. If your baby wasn't born in the hospital or if you have left the hospital before the baby could be tested, talk to your health care provider about scheduling testing as soon as possible.
