Background: Spirometry is an excellent screening test for detection of chronic airflow obstruction, localizing and grading a critical orifice in the central airways, but may also be useful in detecting restrictive disorders. The present study was a computerized spirometry study conducted to assess ventilatory test among healthy subjects of North India with no history of smoking. Material & methods: The present study was conducted in the Department of Physiology, Government Medical College, Patiala, Punjab. A detailed physical examination and different lung function tests were carried out. Mean, standard deviation and standard error of mean and coefficient of variation was calculated and the same represented by tables. Results: Maximum mean and SD Peak Expiratory Flow rate in males was found in age group 50-59 years i.e. 6.95±1.20 Its/sec as compared to 60 and above age groups. Maximum mean MVV in males was found in age group 50-59 years i.e. 109.5±1.20 Its/secas compared to 60 and above age groups. Maximum mean MVV in females was found in age group 50-59 years i.e. 96lts/secas compared to 60 and above age groups. Mean FEF 25-75%,mean FEF 2-12%, FEF 25% , FEF 50%, FEF 75% was higher in males of age group 50-59 yearsas compared to 60 and above age groups. Mean FEF 25-75%, mean FEF 2-12%, FEF 25%, FEF 50%, FEF 75% was higher in females of age group 50-59 years as compared to 60 and above age groups. Conclusion: The study concluded that Maximum mean Peak Expiratory Flow rate, maximum mean MVV in males, Maximum mean MVV in females was found in age group 50-59 years as compared to 60 and above age groups. Mean FEF 25-75%, mean FEF 2-12%, FEF 25%, FEF 50%, FEF 75% was higher in both males and females of age group 50-59 years as compared to 60 and above age groups.