Table 3. Comparison of Xpert and smear positivity in different types of specimen.
| Type of specimen | Total Specimens on Xpert | Total Positive | % (95% CI) | Rif cases | % (95% CI) | Total Tests on Smear | Smear Pos | % (95% CI) |
|---|---|---|---|---|---|---|---|---|
| Total | 46879 | 3653 | 7.8% (7.6–8) | 431 | 11.8% (10.8–12.9) | 41918 | 1062 | 2.5% (2.4–2.7) |
| Gastric Aspirate/ Lavage | 19703 | 1131 | 5.7% (5.4–6.1) | 99 | 8.8% (7.2–10.6) | 17462 | 243 | 1.4% (1.2–1.6) |
| Induced Sputum/Sputum | 19178 | 1499 | 7.8% (7.5–8.2) | 206 | 13.7% (12.1–15.6) | 18658 | 685 | 3.7% (3.4–4) |
| CSF | 3171 | 221 | 7.0% (6.1–7.9) | 22 | 10.0% (6.5–14.9) | 2282 | 0 | |
| Pus/FNAC/Lymph Node/Cervical Asp | 1332 | 519 | 39.0% (36.3–41.6) | 72 | 13.9% (11.1–17.2) | 998 | 87 | 8.7% (7.1–10.7) |
| Pericardial Fluid | 74 | 8 | 10.8% (5.1–20.7) | 0 | 52 | 1 | 1.9% (0–11.6) | |
| BAL | 1193 | 158 | 13.2% (11.4–15.3) | 10 | 6.3% (3.3–11.7) | 869 | 23 | 2.6% (1.7–4.0) |
| Pleural Fluid | 1184 | 56 | 4.7% (3.6–6.1) | 10 | 17.9% (9.3–30.9) | 1109 | 8 | 0.7% (0.3–1.5) |
| Ascitic Fluid | 297 | 9 | 3.0% (1.5–5.9) | 1 | 11.1% (0.6–49.3) | 214 | 1 | 0.5% (0–3) |
| Endo-tracheal Secretion/ Tracheal Aspirate | 141 | 11 | 7.8% (4.2–13.9) | 4 | 36.4% (12.4–68.4) | 80 | 4 | 5.0% (1.6–13) |
| Others* | 606 | 41 | 6.8% (5–9.2) | 7 | 17.1% (7.7–32.6) | 194 | 10 | 5.2% (2.6–9.5) |
*Abscess, bone, Bone Marrow, Chyle Fluid, Cystic Fluid, Knee Aspirate, Liver Biopsy, Peritoneal Fluid, Pleural Biopsy, Right colonic ulceration, Serum, Skin Biopsy, Synovial Fluid, Thoracic swab, Tissue
First and second specimens were positive for 259 presumptive TB patients and 3 tests were positive for 28 children