![]() ![]() These tests may include a chest x-ray or a sputum culture. You will need more tests to find out if you have a latent TB infection or TB disease. Your TB skin or blood test results will usually be positive or negative.Ī positive result means that you have been infected with TB bacteria. This usually takes less than five minutes. You may feel a little sting when the needle goes in or out. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. The professional will let you know whether or not the bump means that you're likely to have TB germs in your body.įor a TB test in blood (also called an IGRA test), a health care professional will take a blood sample from a vein in your arm, using a small needle. The meaning of the bump depends on how large it is, your risk of exposure to TB germs, and your risk for developing active TB disease. If there is a bump of hard skin, the professional will measure the bump. ![]() A health care professional will look at the test spot on your arm to see if your skin reacted. If it itches, you can put an ice cube or cold cloth on it.Īfter two to three days, you will return for the second visit.
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