QuantiFERON-TB Gold (QFT) is a simple blood test that aids in the detection

of Mycobacterium tuberculosis, the bacteria which causes tuberculosis (TB). QFT is an

interferon-gamma (IFN-γ) release assay, commonly known as an IGRA, and is a modern

alternative to the tuberculin skin test (TST, PPD or Mantoux). Unlike the TST, QFT is a

controlled laboratory test that requires only one patient visit and is unaffected by previous

Bacille Calmette-Guerin (BCG) vaccination.