Abstract
Background: Frozen embryo transfer (FET) is an important component of assisted reproductive technology (ART) treatment, accounting for approximately 15% of total ART cycles. Many centers elect to perform all FETs in a programmed cycle using GnRH-agonist down-regulation followed by estrogen and progesterone endometrial preparation. Others use the natural cycle in patients with regular menses to avoid the dependence on injectable steroid replacement, and reserve the programmed cycle for those with oligomenorrhea.
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