Background <p>Tuberculosis is considered a multisystemic disease as it can attack different organs not only lungs. TB results in high morbidity and mortality .Tubercular pleural effusion belongs to extrapulmonary TB .Examination of Ziehl-Neelsen stained smears of pleural fluid rarely detect Acid and alcohol fast bacilli.</p> Aim <p>Study was established to assess the diagnostic yield of fibreoptic bronchoscopy in patients of smear negative tubercular pleural effusion.</p> Methodology <p>This was a retrospective study included 20 patients already diagnosed with tubercular pleural effusion. Studied patients” diagnosis was reached by pleural biopsy whether thoracoscopic or US guided <b>.</b> All studied patients had Flexible fibreoptic bronchoscopy done and bronchoalveolar lavage was stained by Z-N staining for AFB .</p> Results <p>The diagnostic yield of Bronchoalveolar lavage was 35% of studied cases. Sensitivity of BAL staining in comparison to culture of pleural biopsy was 54.55%, specificity was 88.89%.: Positive predictive value was 85.71, Negative predictive value was 61.54. Accuracy was 70%.</p> Conclusion <p>Flexible fibreoptic bronchoscopy is very safe and easy tool in increasing bacteriological yield of patients with tubercular pleural effusion.</p>