Several questions offered a choice between the two tests in a variety of situations, with respondents opting for IGRA more frequently. Most clinicians would use an IGRA for diagnosis of LTBI in patients known to have had BCG vaccination, and while clinicians frequently reported using an IGRA after a positive TST, no respondent performed TST following a positive IGRA. Following an indeterminate IGRA, clinicians were more likely to perform TST than to repeat IGRA. Additionally, a small number of respondents indicated that they would use IGRA becoming negative as a guide to successful therapy.
