Serum Vitamin D Levels and Pregnancy Rates in Women Undergoing Elective Frozen Embryo Transfer (eFET)

The aim of this study is determining the affects of serum vitamin D levels to implantation and clinical pregnancy rates in women undergoing elective vitrified/thawed embryo transfer. Two groups will be identified according to the serum vitamin D levels on eFET transfer day and later on implantation, clinical pregnancy and ongoing pregnancy rates will be compared between those groups