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The 2-Step TB Test is a requirement that expires every year â therefore, everyone needs to get it annually. 2. Exceptions: if youâve had a Chest X-Ray, it expires every 4 years â therefore if youâve had a Chest X-Ray in the past four years, you do not need to get the 2-Step TB Test.
Tuberculosis (TB) Testing & Diagnosis. There are two kinds of tests that are used to detect TB bacteria in the body: the TB skin test (TST) and TB blood tests. A positive TB skin test or TB blood test only tells that a person has been infected with TB bacteria. It does not tell whether the person has latent TB infection (LTBI) or has progressed to TB disease. Other tests, such as a chest x-ray and a sample of sputum, are needed to see whether the person has TB disease.