Conventional methods are inadequate, unreliable, cumbersome and impractical to monitor continuous 24 hours blood glucose level, to overcome this problem development of new test detecting Glycosylated Haemoglobin (HbA1c), indicates plasma glucose level in last 3 months duration hence it is satisfactory tool for assessment of diabetic control. Therefore the present study is planned to know about the glycaemic control of diabetic patient by HbA1c and to know about the various complications. Objectives: To find correlation of Glycosylated Haemoglobin with fasting and post-prandial plasma glucose levels for the diagnosis and control of Diabetes Mellitus.