The Tuberculin skin test, or TB test, is mainly used to screen particular populations that are at high-risk for tuberculosis exposure, such as those with weakened immune systems, those living in confined areas like nursing homes, those who have been in contact with someone with TB, and those at risk of coming into contact with someone without a known case of TB like healthcare workers. The TB skin test is used to help diagnose latent or active tuberculosis infection. If the doctor suspects an infection, confirmatory tests will be ordered such as chest x-rays and acid-fast bacterial (AFB) cultures.
There are no "carriers" when it comes to tuberculosis -- you are either infected or not. A positive TB skin test and a negative chest x-ray can be due to several reasons: 1) you were somehow exposed to tuberculosis, but never became infected or 2) the TB skin test gave a false positive result. The doctor will still administer medicine to this type of patient as an extra precaution. Tuberculosis is airborne and highly contagious.
Always consult with your Doctor if you have any questions or concerns!
