The most common and simple test for diagnosing TB is called a TB Skin Test or Mantoux Tuberculin Skin Test. It involves injecting 0.1ml of PPD Tuberculin intradermally under your skin at 15 degrees. The PPD Tuberculin is an extract of the TB Bacterium. The site of the injection should be checked within 48-72 hours to assess the swelling and the redness of the site.  If the site has a hard, red bump, it is likely to indicate that TB is present. Unfortunately, those tests are not 100% accurate and therefore can provide a false negative and/or false positive test. In addition to TB Skin Test, blood test, sputum test, and Chest X-Rays can be used as other tests to diagnose TB. TB Skin Test is commonly required for health care professionals, nursing/medical students, certain teachers, and for travelers who are going to be doing Mission Work at different regions of the world.