ackground: Diabetes is a major causative risk factor for the development of ACS & the adverse outcome after ACS. ‘Stress hyperglycaemia’ has been defined in different ways by various studies. Transient hyperglycaemia has been recognized as a noticeable feature in ACS and is related to stress (Lakhdar et al., 1984).[1] Glycosylated haemoglobin is thus useful to differentiate between stress hyperglycaemia diabetes mellitus. Glycosylated haemoglobin has more sensitivity and specificity for diagnosing diabetes in acute myocardial infarction patients, than admission hyperglycaemia