![]() ![]() Your health care provider may take a sample of the mucus that comes up when you cough, also called sputum. X-rayĪ chest X-ray can show irregular patches in the lungs that are typical of active TB disease. Other tests of the blood sample can help determine if you have active disease.Ī negative result means you likely do not have a TB infection. A positive test shows that you have either a latent TB infection or active TB disease. One lab test finds out whether certain immune system cells can "recognize" tuberculosis. Blood testsĪ sample of blood is sent to a lab. It doesn't necessarily mean you don't have an infection. People who had a TB vaccination might get a positive test even if they have no infection.Ī negative test means that your body didn't react to the test. A positive test indicates you likely have either a latent TB infection or active TB disease. ![]() ![]() This test is seeing if your immune system reacts, or has made an antibody, to tuberculosis. The size of the raised skin is used to determine a positive or negative test. Within 48 to 72 hours, a health care worker will check your arm for swelling at the injection site. Skin testĪ tiny amount of a substance called tuberculin is injected just below the skin on the inside of one forearm. Your provider will determine whether a skin test or blood test is the best option. You have health risks for active TB disease.You were likely exposed to a person with active TB disease. ![]()
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