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Vitamin D deficiency has been reported worldwide. It has been reported at suboptimal levels in gestation. The levels vary during various trimesters of pregnancy. This article focuses on the gestation week wise variations observed in the serum cholecalciferol levels during gestation. 100 venous blood samples were collected from singleton, non-smoking pregnancies. The samples were collected in the summer and winter seasons during various weeks of pregnancy. The samples were collected randomly in patients who were not supplemented with vitamin D. The serum cholecalciferol levels were observed to be deficient during the first trimester (below<30 ng/ml), there was an increase in the vitamin D levels in the second trimester (levels<30 ng/ml). During the third trimester, the levels increased gradually. The ratio of cases deficient during the first trimester was higher when compared to the second and third trimesters. The serum cholecalciferol levels remain deficient due to the foetal organogenesis in the first trimester. The serum 25 hydroxy cholecalciferol levels are compensated with the development of the placenta. During the second trimester, it gradually increases and reaches sufficient limits during the third trimester.
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