Serum hyperglycaemia resulting from defects in insulin secretion, insulin action (may be due to failure of complex insulin – receptor interaction) or both. According to the International Diabetes Federation (IDF), diabetes has affected at least 300 million people worldwide, and this number is expected to reach 450 million by the year 2030. There are mainly two types of diabetes Type–1 and Type–2, the latter type of diabetes mellitus is the most common form of diabetes accounting for 90% of the cases. In India, the scenario is not different when compared to the world scenario. The best strategies are not able to prevent the complications suggesting that alternative treatment strategies are needed. Insulin–dependent uptake of glucose is reduced in magnesium deficiency. Magnesium supplementation improves glucose tolerance. So one such treatment strategy under research is supplementation of magnesium and its role in primary prevention of diabetes and slowing the progression of complications that is related to the dreaded disease. So before anything it is best to understand the profile of serum magnesium in type 2 Diabetes mellitus. So this study is dedicated for this above said cause.