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1162 Research Letters hydroxychloroquine use within 1 year of QFT-G testing. We also evaluated the concomitant use of additional antimalarials, prednisone, and diseasemodifying antirheumatic drugs (DMARDs). In the study population of 89 patients, 45 were in the hydroxychloroquine group, while 44 did not use hydroxychloroquine in the year before testing. The basic demographic characteristics of both groups are presented in Table I. In total, there were 22 (25%) indeterminate, 54 (61%) negative, and 2 (2%) positive QFT-G results. The hydroxychloroquine group had significantly more indeterminate QFT-G results (38%) compared with the nonhydroxychloroquine group (6.6%; P\. 01). There was no significant difference in concomitant use DMARDs (P [. 05) between groups (Table II). The hydroxychloroquine group had significantly more patients who were taking prednisone compared with the …