Evaluation of the Effect of Embryo Transfer Methods on Pregnancy Outcomes: A Retrospective Study and Future Perspectives.

Background: Trans-abdominal ultrasound (TAUS) and transvaginal ultrasound (TVUS) are used for embryo transfer. However, few studies were conducted to compare the methods and assess their effect on pregnancy outcomes.

Methods: A retrospective cohort study was conducted at Mahdieh Hospital in Tehran, analyzing 506 ICSI cycles with fresh embryo transfer.