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. 2019 Aug 19;40(1):33–39. doi: 10.3343/alm.2020.40.1.33

Fig. 1. Comparison of the calculated IFN-γ value of the TB antigen tube minus the negative control between QFT-GIT and the CLIA-IGRA. The correlation between the two assays was determined for three subgroups: samples with a calculated IFN-γ value of (A)<5 IU/mL, (B)<2 IU/mL, and (C)<1 IU/mL.

Fig. 1

Abbreviations: IFN-γ, interferon gamma; TB, tuberculosis; QFT-GIT, QuantiFERON-TB Gold In-Tube; CLIA-IGRA, chemiluminescent immunoanalyzer-based IFN-γ releasing assay; R, Pearson's correlation coefficient.