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Diabetes affects many organs of the body,present with microvascular pathologies. lungs of diabetic shows thickening of alveolar epithelial and pulmonary capillary basal lamina leading to reduced pulmonary elastic recoil and lung volume. Pulmonary function tests are employed to access the functional capacity of lungs. Present study showsspirometric changes in patients with diabetes mellitus. Effect ofdiabetes mellitus on spirometric values explored a reduction in FVC, FEV1. There was a restrictive pattern of Pulmonary abnormality though patients were asymptomatic. There was a correlation between reduced Pulmonary function values , duration of diabetes mellitus , glycemic control.Reduction in lung diffusion capacity is common in diabetic patients with signs of microangiopathy.