Abstract
Various factors, including treatment protocols, can influence the outcomes of frozen embryo transfers (FETs). In order to prepare the endometrium, several protocols have been suggested: natural cycles, where detecting the luteinising hormone (LH) surge, and, therefore, the ovulation, defines the timing of the transfer; modified natural cycles, where ovulation is triggered by the administration of human chorionic gonadotrophin (hCG); hormone replacement therapy (HRT) or artificial cycle with estradiol (E2) and progesterone (P4), with or without using gonadotropin-releasing hormone (GnRH) analogs; and, finally, stimulated cycles with low doses of gonadotropins.
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