openalexFrontiers in Endocrinology2026-07-23
Association of LH rising before luteal support and reproductive outcomes in artificial frozen embryo transfer cycles
Ming-Hsuean Chien, Tsung‐Hsuan Lai
Introduction In natural cycles, rising estradiol (E2) suppresses pituitary luteinizing hormone (LH) secretion until a threshold is reached, triggering the LH surge and ovulation. During artificial-cycle frozen embryo transfer (AC-FET), prolonged E2 exposure may induce endogenous…