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Table 2 Performance of QFT-GIT for diagnosis of active TB

From: QuantiFERON-TB Gold In-tube test for the diagnosis of active and latent tuberculosis in selected health facilities of Addis Ababa, Ethiopia

Category Nb QFN, N (%)
Positive, N (%) Negative, N (%) Intermediate, N (%)
HIV positive 21 9 (42.9) 11 (52.4) 1 (4.8)
HIV negative 115 66 (57.4) 48 (41.7) 1 (0.9)
CD4 < 200 cells/µl 25 11 (44.0) 13 (52.0) 1 (4)
CD4 ≥ 200 cells/µl 112 65 (58.0) 46 (41.1) 1 (0.9)
Smear positive 12 5 (41.7) 7 (58.3) a
Smear negative 124 70 (56.5) 52 (41.9) 2 (1.6)
Culture positive 37 26 (70.3) 10 (27.0) 1 (2.7)
Culture negative 99 49 (49.5) 49 (49.5) 1 (1.0)
BCG vaccinated 40 23 (57.5) 17 (42.5) a
BCG not vaccinated 96 52 (54.2) 42 (43.8) 2 (2.0)
Sputum with blood 28 19 (67.9) 9 (32.1) a
Breath shortness 90 52 (57.8) 38 (42.2) a
Night sweats 99 53 (53.5) 44 (44.4) 2 (2.1)
Chest pain 110 64 (58.2) 45 (40.9) 1 (0.9)
Weight loss 91 49 (53.8) 40 (44.0) 2 (2.2)
  1. aIntermediate results were not found
  2. bIn all the percentage calculations, N was taken as denominator