Laya Farzadi - Women’s Reproductive Health Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Homa Khayatzadeh Bidgoli - Women’s Reproductive Health Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.
Morteza Ghojazadeh - Liver and Gastrointestinal Disease Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
Zahra Bahrami - Women’s Reproductive Health Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.

Background: Vitamin D in complex with its receptor by regulating gene expression, endometrium immune response and stimulation of endometriumdecidualization can be involved in implantation. So, it seems that the amount of vitamin D in follicular fluids (FF) may have an association with ART success.Objective: First, we intended to investigate the possible association between levels of follicular fluids 25-OH vitamin D with assisted reproductive outcomes. Second,we examined relationship between 25-OH vitamin D levels with number and quality of oocytes.Materials and Methods: In a prospective study, 80 infertile female candidates for IVF/ICSI were enrolled. Blood samples (on the day of human chorionicgonadotropin administration) and follicular fluids were taken, and then levels of serum estradiol and follicular fluids 25-OH vitamin D were measured. Also clinicalcharacteristics of patients (duration of infertility, causes of infertility, menstrual status), number and quality of oocytes, number of fertilized oocytes, estradiol levels,and clinical pregnancy were evaluated. Results: Concentration of FF 25-OH vitamin D in pregnant women wassignificantly higher than non-pregnant women (p=0.007) but there were no significant differences in age, body mass index (BMI), duration of infertility,menstrual status, number of oocytes, oocytes quality, number of fertilized oocytes, and serum estradiol levels between the two groups. Statistically positive correlationwas found between 25-OH vitamin D levels with patient age and implantation rate (r=0.264, p=0.018 and r=0.301, p=0.007 respectively). Conclusion: The obtained results suggest that vitamin D without affecting the number and quality of oocytes can independently improve implantation rate and IVF outcome.

Embryo implantation, Vitamin D, In vitro fertilization, Outcome