Table 2.
Ultrasound findings in relation to evidence of TB
| Finding | TB positive | TB negative | PPV | NPV |
|---|---|---|---|---|
| n = 31 | 22 | 9 | ||
| Ascites | 16 | 6 | 73% | 33% |
| Ascites with fibrinous stranding | 12 | 2 | 86% | 41% |
| Intra-abdominal lymphadenopathy | 9 | 4 | 69% | 27% |
| Hepatomegaly | 8 | 2 | 80% | 33% |
| Splenomegaly | 1 | 1 | - | - |
| Mesenteric mass | 6 | 1 | 86% | 33% |
| Pancreatic mass | 0 | 0 | - | - |
Note that if some cases of TB were missed through false negative cultures, then PPV and NPV will be under-estimated. Predictive values were not calculated when numbers were very small.
PPV, positive predictive value. NPV, negative predictive value.