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Table 1 Results of IGRA and TB in HCW

From: Screening for tuberculosis and the use of a borderline zone for the interpretation of the interferon-γ release assay (IGRA) in Portuguese healthcare workers

TB

QFT results

Total

Negative

Borderline

Positive

<0.2 IU/mL

0.2– <0.7 IU/mL

≥0.7 IU/mL

n

%

N

%

n

%

n

%

TB in history

16

28.1

15

26.3

26

45.6

57

2.0

Active TB at screening

0

-

2

25.0

6

75.0

8

0.3

Progression to active TB

0

-

1

25.0

3

75.0

4

0.1

No TB

1,764

62.7

323

11.5

728

25.9

2,815

97.6

All

1,780

61.7

341

11.8

763

26.5

2,884

100.0