Background: Patients with diabetes mellitus (DM), have poor long term glycaemic control, even when fasting glucose concentrations are normal.3,4, Glycosylated haemoglobin (HbA1c) is a useful index of glucose intolerance and hyperglycaemia. HbA1c is an established marker of long-term glycaemic control. HbA1c can be assessed in the non-fasted state and has higher reproducibility than fasting glucose. Aim of the Study: To study the blood levels of HbA1C in patients of Acute Coronary Syndrome at the time of admission and to find out the correlation with the angiographic pattern.