What is the luteal phase of the menstrual cycle?

Updated: Jan 08, 2019
  • Author: Kristi A Tough DeSapri, MD; Chief Editor: Richard Scott Lucidi, MD, FACOG  more...
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Answer

The lifespan and steroidogenic capacity of the corpus luteum depends on continued LH secretion from the pituitary gland. The corpus luteum secretes progesterone that interacts with the endometrium of the uterus to prepare it for implantation. This process is termed endometrial decidualization.

In the normal ovulatory menstrual cycle, the corpus luteum declines in function 9-11 days after ovulation. If the corpus luteum is not rescued by human chorionic gonadotropin (hCG) hormone from the developing placenta, menstruation reliably occurs 14 days after ovulation. If conception occurs, placental hCG interacts with the LH receptor to maintain luteal function until placental production of progesterone is well established.


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