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Testing every 2 to 3 years is recommended for children who have been exposed to high-risk individuals and at age 4 to 6 for those living in high prevalence areas, those who travel to countries with high prevalence, and those whose parents have emigrated from countries with high prevalence of TB.
To screen for tuberculosis (TB) When you have a high risk of exposure to TB; sometimes as part of an examination prior to starting school or a new job (such as a college student, teacher, or daycare employee); when you have signs and symptoms consistent with TB. For a tuberculin skin test, no sample is required. A small amount of purified protein derivative (PPD) solution is injected just under the first layer of skin of your inner forearm. For an interferon gamma release assay, a blood sample is drawn by needle from a vein in your arm.