A cross sectional study was conducted to asses Pulmonary Functions to find out abnormalities caused as a sequel of Pulmonary Tuberculosis in cured patients. Present study also aimed to find presence of diffusion defect against alveolar capillary interface with the help of DLCO in Patients with Spirometric abnormality. A Microbiologically confirmed cases of Pulmonary TB patients who completed optimum period of treatment and tested negative for sputum for acid fast bacilli were included in the study. In this study, a total of 100 cases were taken in which there were 56 symptomatic and 44 asymptomatic post‐TB cases. In both these groups males were predominant with 60% and 56% respectively. Mean age was 46±10years in both groups. Main symptoms in symptomatic group were shortness of breath in 42 of the 56 symptomatic cases(75%), cough in 28 of 56 symptomatic cases(50%). Of the total 100 cases normal spirometric pattern was found in 30%, obstructive pattern in 50% patients with 62% of them being bronchodilator responsive, restrictive & mixed pattern in 14% & 6% of cases respectively. In spirometry assessment of 56 symptomatic post‐TB cases, obstructive pattern was predominant type documented in 29 cases (52%) & bronchodilator responsiveness in 18 cases i.e. 62% of total cases with obstructive pattern, 16% restrictive & 7% mixed pattern abnormality and normal pattern in 25%. In spirometry assessment of 44 asymptomatic post‐TB cases, obstructive pattern is documented in 21 cases (47.6%) out of which bronchodilator responsiveness is present in 13 cases (62%), mixed pattern in 4.5%, restrictive pattern in 11% and normal spirometry is documented in 36.3% cases. Out of 56 symptomatic patients 42 had shortness of breath and 28 complained of cough. Out of 50 patients diagnosed with obstructive pattern abnormality diffusion defect was present in 22(44%) and all 14(100%) cases diagnosed with restrictive pattern had diffusion defect. Authors concluded that The most common cause of lung function impairment in symptomatic post-TB individuals is obstructive lung disease. In spirometry analysis, a considerable proportion of asymptomatic post-TB subjects also have an obstructive pattern of lung function. In a clinical setting, such cases receive less evaluation and treatment. In all TB patients, regardless of symptoms, a prompt examination with spirometry is essential.