Published online by Cambridge University Press: 12 February 2021
In ovarian stimulation cycles for IVF/ICSI, a defective luteal phase occurs in almost all patients as a result of the multifollicular development and supraphysiological hormonal levels, which inhibit the LH secretion by the pituitary via negative feedback actions at the level of the hypothalamic-pituitary axis. Progesterone is crucial to induce secretory transformation of the endometrium after previous estrogenization, a process which will finally result in a receptive endometrium. Consequently, luteal phase support (LPS) represents an essential part of ART treatment in case of a planned fresh embryo transfer, as it is crucial to counterbalance the luteal phase insufficiency.
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