
Plants Magnesium is very important in health and medicine. Magnesium deficiency affects every system of the body. Magnesium is a crucial element for mediating the vital functions of the nervous and endocrine systems. It helps maintain normal muscle and nerve functions, keeps heart rhythm steady, supports a healthy immune system and keeps bones strong. Aims and Objectives: The present study was undertaken: 1. To determine the level of serum magnesium in non-pregnant women of child-bearing age.2 .To determine the level of serum magnesium in pregnant women in different trimesters of pregnancy.3. To compare serum magnesium level of non-pregnant women with serum magnesium level of pregnant women in different trimesters of gestation. Materials and methods: The present study was carried out in the Deptt. Of Obstetrics and Gynaecology, Patna Medical College and Hospital, Patna during September2006 to September2008. Estimation of Serum Magnesium Level: by colorimetric method using “Titan Yellow”. A significant lowering of the serum magnesium level has been observed on comparing the mean values of first and second trimesters. A significant decline was also noted between the second and third trimesters. The decline in serum magnesium level when comparing the first and third trimester values was highly significant.