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Table 4 QuantiFERON-TB results in HCW for various TST reactions

From: Screening for latent tuberculosis in Norwegian health care workers: high frequency of discordant tuberculin skin test positive and interferon-gamma release assay negative results

Induration (mm) TST (n = 387) QFT (n = 13)
  n (%) n (% of TST group)
≥ 6 214 (55.3) 10 (4.7)
0-5 154 (39.8) 2 (1.3)
6-10 85 (22.0) 4 (4.7)
11-14 76 (19.6) 4 (5.3)
≥ 15 53 (13.7) 2 (3.8)
No TST1 19 (4.9) 1 (5.3)
  1. TST = tuberculin skin test. QFT = QuantiFERON-TB.
  2. 1)Not tested due to previous strong response or previous active TB.