The purposes of this study 1. to compare the positivity of tuberculin skin test(TST) and QuantiFERON-TB Gold (QFT-G), and determine the level of agreement between two tests in patients with rheumatic diseases 2. to evaluate the difference in the occurrence of active TB in patients who receive both QFT-G and TST compared with those who receive only TST for detecting of Latent tuberculosis infection(LTBI) who are candidates of TNF inhibitors.
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The agreement between QuantiFERON-TB Gold(QFT-G) and tuberculin skin test(TST) as a screening test for latent tuberculosis infection(LTBI)
Timeframe: one year