Chronic Obstructive Pulmonary Disease (COPD) is the world's third leading cause of death, accounting for 3.23 million deaths in 20191. It is the second major cause of death in India and affects an estimated 53 million people 1. BODE INDEX is multivariable grading system that estimates severity of respiratory and systemic components of COPD patients and was designed to predict quality of life in COPD patients. The four variables BMI (B), FEV1% predicted (O), Dyspnoea (D) as measured by MMRC, Exercise capacity (E) as measured by the six-minute–walk test. In stable COPD patients desaturation upon exertion is a major factor which can be used as a predictor of QOL (quality of life) , future exacerbations, severity  of the disease etc. The current study is focussed upon estimation of COPD prevalence by clinical severity stages as measured by BODE index and the correlation between exercise induced desaturation and various quartiles of  BODE INDEX in stable COPD patients.