Tuberculosis (TB) is  a blood test used in identifying infections with Mycobacterium tuberculosis, the bacteria that causes Tuberculosis (TB).QuantiFERON-TB Gold+ testing can be performed during a single visit and does not require a second interpretation visit, as with tuberculin skin testing. The results of QuantiFERON-TB Gold+ testing are objective, do not require training to interpret, and are not subject to variability in reading methods