Number of subjects with unusual IFN-γ measurements when QuantiFERON-TB Gold and QuantiFERON-TB Gold In-Tube tests were run simultaneously.

The number of subjects with unusual IFN-γ measurements categorized as High Nil Concentration (HNC), Low Mitogen Response (LMR), Very Low Mitogen Response (VLMR), and Very Low Antigen Response (VLAR) that occurred only with the QuantiFERON-TB Gold test (light gray bars), with the QuantiFERON-TB Gold In-Tube test (dark gray bars), or in both the QuantiFERON-TB Gold and QuantiFERON-TB Gold In-Tube test (medium gray bars) among 1,617 subjects with simultaneously performed QuantiFERON-TB Gold and QuantiFERON-TB Gold In-Tube Test.