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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.
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