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Table 1 Cycle characteristics for frozen embryo transfer preparation

From: The impact of endometrial preparation for frozen embryo transfer on maternal and neonatal outcomes: a review

  Estrogen Timing of transfer Progesterone
Ovulatory Cycles
 Natural cycles Follicular development LH surge Corpus luteum
 Modified natural cycles Follicular development hCG trigger Corpus luteum with or without supplemental progesterone
 Stimulated cycles Follicular development hCG trigger or LH surge Corpus luteum with or without supplemental progesterone
Programmed Cycles
 Programmed cycles Exogenous estrogen (oral, vaginal, transdermal) Initiation of progesterone Intramuscular and/or vaginal progesterone