Micro- and macro-vascular complications are the leading cause of morbidity and mortality in persons with diabetes. Strict monitoring and maintenance of normal blood glucose and prevention of different risk factors can prevent and delay vascular complications. Though these are not new risks but it is found that poor glycaemic control, hypertension, obesity, dyslipidaemia etc. have been gradually increasing and is thought to be the driving influence behind the epidemic of diabetic vascular diseases faced today. The contributions of risk factors, especially blood glucose levels are yet to be clearly identified and quantified. This book is about gaining the new insights into how different risk factors, especially HbA1c affect and reflect the risk of vascular diseases among patients with type 2 diabetes. These findings will stress the need of HbA1c estimation for early detection of the diabetic patients who are at the risk of development of vascular complications and help to delay andprevent the complications.