Tuberculosis (TB) testing identifies individuals infected with Mycobacterium tuberculosis. Two methods are used: the Tuberculin Skin Test (TST or Mantoux test), where purified protein derivative (PPD) is injected intradermally and read at 48–72 hours; and Interferon-Gamma Release Assays (IGRAs) like QuantiFERON-TB Gold and T-SPOT, which require a single blood draw with no return visit. Neither test distinguishes latent from active TB — a positive result requires a chest X-ray. Many employers require TB testing for new hires and annually for healthcare workers, school employees, childcare workers, and food service employees. State requirements vary. BlueHive provides both TST and IGRA testing through its clinic network.