TB skin test

TB skin test, also known as tuberculin test, Mantoux, or PPD test. It can be performed in a nurse's office and you will be asked to visit the office twice, once for the test and again after 48-72 hours for test interpretation. This test helps to determine if you have had an infection with Mycobacterium tuberculosis (TB) by injecting a small amount of tuberculin (PPD protein) just beneath the skin. If you have been infected in the past, a firm red bump of considerable size will be formed in your arm. The specific size of the bump together with your risk factors will be used to determine the result of the PPD test. A positive TB skin test indicates active or silent (latent) TB infection and means you need further examination, such as a chest x-ray and possibly an antibiotic to treat the infection.