Abstract

In IVF, two oocyte maturation trigger modalities are available: the more commonly used human chorionic gonadotropin (hCG) and gonadotropin releasing hormone agonists (GnRHa). GnRHa stimulates an endogenous release of gonadotropins similar to a natural surge, but the shorter duration of the surge and the pituitary down-regulation properties of the drug result in a dysfunctional and shortened luteal phase (1). Prior studies have evaluated the duration of time between stimulation and frozen-thawed embryo transfer (FET) but only one specifically after GnRHa trigger which showed equivalent pregnancy rates (2).

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