This article explores the clinical features and  diagnostic utility of bronchoalveolar lavage associated with tuberculosis.Early diagnosis of pulmonary tuberculosis (PTB) is essential to reduce the spread, morbidity, mortality, and escalating costs associated with advanced disease.In this article 45 cases of tuberculosis are presented, highlighting the role of bronchoalveolar lavage . Mycobacterial culture is considered gold standard but time taken for results is 2-6 weeks. Bronchoalveolar lavage (BAL) is a safe, minimally invasive and inexpensive diagnostic technique commonly used to obtain cells, infectious agents and noncellular elements from the lower respiratory tract in patients with bilateral diffuse lung diseases.Bal fluid sample is also being used for applying Gene Xpert for MTB in our hospital sectors. Evaluation FOB/BAL is a useful diagnostic tool, and seems to have changed the course of therapy in more than half of patients, by initiation or cessation of treatment.