Figure 1: A flow diagragm showing sampling procedure and how the reference test and the index test was applied among TB suspects. Out of 323 suspects, 6 smear positive but culture negative patients were excluded. A total of 101 suspects were confirmed as culture positive pulmonary TB patients whereas 216 suspects were both culture and smear negative. The index test was done on 89 culture confirmed pulmonary TB patients and 115 culture and smear negative non-TB patients. The sensitivity and specificity of the index test were 91.0% and 41.7%, respectively. Index test: ELISA using rESAT-6-CFP-10 antigen.