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The fourth component of a complete TB medical evaluation is a chest x- ray. A patient should have a chest x-ray if he or she has a positive IGRA or TST result or has signs and symptoms of TB disease.


The chest x-ray will usually appear abnormal when a patient has TB disease in the lungs. It may show infiltrates or cavities.


However, chest x-ray results cannot confirm that a person has TB disease. A variety of illnesses may produce abnormalities whose appearance on a chest x-ray resembles TB.

Doctor reviewing chest x-ray