The Impact of Estrogen Administration Duration in Hormonally Prepared Frozen Embryo Transfer Cycles

The timing of P initiation in HRT cycles depends on the thickness and morphology of the endometrium, which are influenced by the duration of E2 treatment. Although numerous studies have examined the effect of E2 treatment duration on endometrial thickness and morphology, the results have been inconsistent, and the impact on live birth rates (LBR) remains unclear. Previous research has explored the impact of standard 12-day E2 therapy and prolonged periods of E2 administration on pregnancy outcomes. However, the present study aims to compare the effects of standard 12-day E2 therapy with shorter-term E2 application and evaluate their impact on treatment outcomes. To test hypothesis, investigators conducted a prospective analysis of about 500 hormonally prepared frozen embryo transfer (FET) cycles performed between January 2020 and December 2021 at IVF center in Akdeniz University. The objective of this study was to determine the optimal duration of estrogen (E2) therapy prior to progesterone (P) initiation for FET cycles in terms of live birth rate (LBR). In IVF center, patients with frozen embryos routinely applied to the center on weekdays (Monday, Wednesday, and Friday) as part of a predetermined treatment plan. Patients who presented to the clinic during their menstrual periods were scheduled to receive E2 therapy for a duration of either 5-7, 8-10, or 11-13 days, depending on the day they presented. After the application of micronized E2 at a daily dose of 4-6mg, transvaginal ultrasonography was performed to assess endometrial thickness. If the endometrial thickness was found to be above 7mm, daily 300mg of vaginal micronized P tablets were initiated, and FET was performed on the 6th day of P treatment. Patients whose endometrial thickness was less than 7 millimeters on transvaginal ultrasonography after the application of E2 treatment for the specified day and who had to continue estrogen therapy were not included in the study. The duration of E2 administration prior to P initiation was categorized into three groups: 5-7 days, 8-10 days, and 11-13 days. The primary outcome of this study was LBR, which was defined as the delivery of a live-born infant after 24 weeks of gestation. Secondary outcomes included implantation rate, clinical pregnancy rate, and miscarriage rate.