Frequency of Unusual IFN-γ Measurements with QuantiFERON-TB Gold and QuantiFERON-TB Gold In-Tube Testing.

a“QFT-G” is QuantiFERON-TB Gold test.
b“QFT-GIT” is QuantiFERON-TB Gold In-Tube test.
c“Total # of subjects” with unusual measurement may be less than the sum of the “# of subjects” with unusual QFT-G and QFT-GIT measurements because subjects may have unusual measurements with both tests.
d“OR (95% CI)” is odds ratio and 95% confidence interval for an unusual IFN-γ measurement in QFT-G compared to referent, QFT-GIT.
e“HNC” is High Nil Concentration (i.e. [Nil] over 0.7 IU/mL).
f“LMR” is Low Mitogen Response (i.e. Mitogen Response under 0.5 IU/mL).
g“VLMR” is Very Low Mitogen Response (i.e. Mitogen Response ≤−0.5 IU/mL).
h“VLAR” is Very Low Antigen Response (i.e. response to a Mtb antigen ≤−0.35 IU/mL and ≤−0.5 times [Nil]).