Diabetes mellitus is a disease which is affecting 5.9% of the world’s adult .The most common (90%) form of diabetes mellitus is type-2 diabetes mellitus and almost 80% of the total cases are found to be in the developing countries. According to International Diabetes Federation (IDF) 366 million people had diabetes in 2011 and by 2030 this will rise to 552 million. Due to large population, diabetes epidemic is much more pronounced in India where over 61 million diabetics reside and in 2030 it cross the100 million mark1 spirometric lung function parameters (FEV1and FVC), were decreased in type-2 diabetics13 and the calculation of FEV1/FVC allow the identification of obstructive or restrictive ventilatory defects.27 This investigation's primary goal was to assess how people with diabetes mellitus's lungs performed during spirometer.

diabetes mellitus (DM), spirometer, Forced vital capacity (FVC), forced expiratory volume at 1st second ( FEV1)