Interpretation Criteria used for QuantiFERON-TB Gold and QuantiFERON-TB Gold In-Tube^a Tests.

aInterpretation criteria used for QFT-GIT differed from that approved by the FDA in Nov, 2008. b“[Nil]” is the IFN-γ concentration in plasma from unstimulated blood. c“TB Response” for the QuantiFERON-TB Gold test is the higher IFN-γ concentration in plasma from blood stimulated by a cocktail of peptides representing ESAT-6 or CFP10, minus [Nil]. d“TB Response” for the QuantiFERON-TB Gold In-Tube test is the IFN-γ concentration in plasma from blood stimulated by a single cocktail of peptides representing ESAT-6, CFP10, and part of TB7.7 minus [Nil]. e“Mitogen Response” is the IFN-γ concentration in plasma from mitogen stimulated blood minus [Nil].