Association of diabetes with tuberculosis is well known. The converse relation (i.e.) patients with tuberculosis have higher prevalence of impaired glucose tolerance was accepted later. In this study we tried to determine the prevalence rate of impaired glucose tolerance in newly detected pulmonary tuberculosis patients. In this study impaired glucose tolerance was found in 22% (11patients), diabetes mellitus found in 8% (4 patients). After two months of treatment for tuberculosis 5 patients of impaired glucose tolerance reverted to normal, 6 patients remained impaired glucose tolerant. In this study 70% (35) of patients had sputum positivity, out of 35 patients, 24 (48%) patients showed normal glucose tolerance, 11(22%) patients showed impaired glucose tolerance. As per this study there is no easy way to identify the tuberculosis patients with asymptomatic diabetes. There is significant correlation between sputum positivity and impaired glucose tolerance.