The objective of present study was to screen out the diabetes mellitus by fastingblood glucose (FBG) in patients with pulmonary tuberculosis. Background: Diabetes mellitusand Tuberculosis has strong co-relation and complicates each other. Diabetes increases therisk of infections including tuberculosis particularly pulmonary TB, Therefore making antituberculousdrugs ineffective. Similarly M. tuberculous infection predisposes to diabetesmellitus and complicates it further. Patients simultaneously having, both diabetes mellitus andtuberculosis, the chances of multiple systems involvement becomes high. The delayed orineffective response to anti tuberculous chemotherapy raises suspicion of underlying diabetesmellitus .There for such patients should be screen out by fasting blood glucose (FBG) levels soas to treat the treat the diabetes as well. Objectives: The objective of this study was to screenout diabetes in pulmonary TB patients by fasting blood glucose level (FBG) especially wherethe treatment response of anti-tuberculous drug is delayed or poor. Study Design: This wasprospective observational study. Place and Duration of Study: This study was conductedat DHQ-teaching hospital Mirpur Azad Kashmir from February 2013 to December 2014 .Thisincluded both in and outdoor patients. Inclusion criteria: 1. Age range of tuberculous patientsbetween 20-40 years. 2. Pulmonary tuberculous patients. Exclusion criteria: 1. PulmonaryTB patients with co-existent diabetes mellitus. 2. TB patients with renal failure, autoimmunediseases like rheumatoid arthritis, SLE, immunosuppressant drugs and steroid were excluded.Material and Methods: Ninety-five diagnosed patients of pulmonary TB were selected. Thequestionnaire form was designed according to objective of study. This Included with patientshaving pulmonary TB with but still not screened out for diabetes .The questionnaire containedhistory, general physical and systemic examination, especially respiratory system. Risk factorslike family history of diabetes and TB were evaluated. The socio–economic status of patients wascarefully assessed. Routine investigations like complete blood count, ESR, fasting and randomblood glucose were done. Three morning sputum specimens and fasting blood glucose (FBG)were main tools of diagnosis of TB. The data thus obtained, was subjected to SPSS verssion-20for statistical analysis. Results: A total of 95 patients with pulmonary tuberculosis were selectedincluding in and outdoor patients. Out of them, 65 patients were males, and 30 were females.Age group mainly ranging between 20-40 of years. Screening of diabetes in 95 tuberculouspatients was done by fasting blood glucose. Seventeen patients (17), twelve (12) male and five(05) female were screened out to be diabetic. Conclusion: Screening by fasting blood glucoseis an effective tool in diagnosis of diabetes mellitus in tuberculous patients.