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. 2026 Jul 22;17:1898027. doi: 10.3389/fendo.2026.1898027

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Copyright © 2026 Asoglu, Darıcı Kurt, Bozdag, Boynukalin, Ozdamar and Bahceci.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Flowchart illustrating the selection of first HRT-FET cycles from January 2020 to June 2025, starting with two thousand seven hundred ninety-three cycles, excluding ineligible cases for reasons such as age, protocols, or missing data, resulting in two thousand one eligible cycles. These are divided into short, intermediate, and prolonged protocol groups, showing rates of cycle cancellation due to elevated progesterone, followed by embryo transfers and concluding with one thousand nine hundred thirty-five cycles analyzed for reproductive outcomes. — STROBE checklist for the reporting of this retrospective cohort study.