Definition

Noun: - The luteal phase is the second, post-ovulatory stage of the menstrual cycle. During this phase, the ruptured ovarian follicle transforms into the corpus luteum, which secretes the hormone progesterone. This hormonal activity prepares the uterine lining (endometrium) to receive and support a fertilized embryo. If fertilization and implantation do not occur, the corpus luteum degenerates, progesterone levels fall, and the menstrual period begins, marking the end of this phase and the cycle.

Usage Examples

• Noun:
  • The length of the luteal phase is typically around 12 to 14 days.
  • Progesterone levels peak during the luteal phase to support a potential pregnancy.
  • A short luteal phase can sometimes be associated with fertility challenges.

Advanced Usage

• "Defective luteal phase": A clinical term for a luteal phase that is too short or characterized by insufficient progesterone production, potentially hindering embryo implantation.
  • The doctor diagnosed a defective luteal phase as a possible cause of her recurrent early miscarriages.

Variants and Related Words

• Luteal (Adjective): Of or relating to the corpus luteum or the luteal phase.
  • Tracking basal body temperature helps identify the luteal shift after ovulation.
• Corpus Luteum (Noun): The endocrine structure formed in the ovary after ovulation that produces progesterone during the luteal phase.
• Secretory Phase (Noun): A synonym often used in medical contexts, referring to the endometrial changes driven by progesterone secretion during the luteal phase.

Synonyms

• Postovulatory Phase: The phase following ovulation.
• Secretory Phase: Emphasizes the endometrium's state as it secretes substances to support implantation.

Related Terms and Concepts (Not Phrasal Verbs)

• Follicular Phase: The first half of the menstrual cycle, preceding ovulation and the luteal phase.
• Menstrual Cycle: The complete monthly cycle, of which the luteal phase is a key part.
• Progesterone: The primary hormone secreted during the luteal phase.

Noun

1. the second half of the menstrual cycle after ovulation; the corpus luteum secretes progesterone which prepares the endometrium for the implantation of an embryo; if fertilization does not occur then menstrual flow begins