Introduction. Diabetes mellitus (DM) is a metabolic disorder. DM affects various organs of human body. Hyperglycaemic state can reduce lung function by decreasing elastin proteins and lung surfactans. Moreover, it can cause diffusion perfusion disorders. Haemoglobin A 1 c (HbA,ol describes previous 3 months of patient's glycaemic state. HbA" is a gold standard to determine controlled and uncont…