Clinical impact of endogenous luteinizing hormone in frozen–thawed embryo transfer during hormone replacement cycle without gonadotropin‐releasing hormone analog coadministration: Effects on pregnancy outcomes

To assess the correlation between serum luteinizing hormone (LH) levels preceding luteal replacement initiation and outcomes of frozen-thawed embryo transfer (FET) cycles during hormone replacement therapy (HRT) without co-administration of gonadotropin-releasing hormone (GnRH) analog.