Figure 1

Pathway of diagnostic work-up of patients suspected of having TB in lung clinics and health centres. Green boxes represent the standardised national TB diagnostic algorithm and the number of patients whose diagnostic work-ups followed the standardised algorithm. Red arrows and boxes represent diagnostic work-ups that did not follow the standardised algorithm. Black boxes represent patients who were lost during diagnostic work-up. Broken arrows represent subsequent diagnostic examinations not shown in the graph. All patients who completed diagnostic work-up underwent sputum smear examinations at a certain point during their diagnostic work-up. After each sputum examination, or series of sputum examinations, the possible outcomes are indicated by '+' (positive) or '-'(negative). TB: tuberculosis; EP TB: extra-pulmonary TB; TB sm+: smear-positive tuberculosis; TB sm-: smear-negative tuberculosis. * Pathway that occurred in health centres only. ** Pathway that occurred in lung clinics only