Objective: The aim of this study is to compare the relationship between pregnancy rates and the season of fertility treatment in infertile women undergoing in vitro fertilization (IVF)-intracytoplasmic sperm injection (ICSI).

Materials and Methods: 562 women who applied to Maltepe University Medical Faculty Training and Research Hospital IVF Clinic due to infertility were included in the study. Age, duration of infertility, basal FSH level, basal E2 level and body mass index, antral follicle number (AFC), antimullerian hormon (AMH) level, E2 level on the day of hCG, endometrial thickness on the day of transfer, fertilization and pregnancy rates were evaluated. Endometrial thickness was measured by transvaginal USG (TV USG) on the day of embryo transfer. The patients were divided into 4 groups according to the season in which they were treated. SPSS 17.00 was used for statistical analysis.

Results: There was no significant difference between the groups in terms of age, infertility duration, basal FSH level, basal E2 level, anti-mullerian hormone (AMH) level and body mass index (p=0.582, p=0.840, p=0.483, p=0.221, p=0.713, p=0.654, respectively. The number of oocytes retrieved, fertilization rates and pregnancy rates were also similar.

Conclusion: It has not been shown that the seasons have an effect on pregnancy rates in patients undergoing IVF-ICSI.