Compacted Thin Endometrium and Reproductive Outcomes in Frozen Embryo Transfer

Background: Endometrial thickness (EMT) is a key predictor of success in frozen-thawed embryo transfer (FET), but a 'thin' endometrium often poses clinical dilemmas regarding cycle progression. Recent evidence suggests that endometrial compaction—a decrease in EMT after progesteroneexposure—may reflect physiological receptivity rather than pathological thinning. However, its prognostic value in patients with thin EMT on transfer day is not yet established.Objectives: To assess the impact of endometrial compaction on live birth rates (LBR) in women with thin EMT (