Luteal Phase
Pronunciation: LOO-tee-al
The post-ovulatory phase of the menstrual cycle characterized by elevated progesterone levels, lasting approximately 14 days.
Full Definition
The luteal phase begins immediately after ovulation and continues until menstruation, typically lasting 12-16 days in healthy women. During this phase, the corpus luteum produces high levels of progesterone and moderate levels of estradiol, preparing the endometrium for potential implantation. Hormone testing during the luteal phase is crucial for assessing ovarian function, confirming ovulation, and diagnosing luteal phase defects. The phase is characterized by relatively stable, elevated progesterone levels (typically >3 ng/mL or >9.5 nmol/L) that can be measured to confirm ovulatory cycles. Understanding luteal phase timing is essential for proper interpretation of reproductive hormone results.
Usage
Usage note: Always specify timing relative to ovulation or menstruation when discussing luteal phase hormone levels.
In Context
- "Progesterone levels drawn during the luteal phase confirmed ovulation had occurred." — Fertility assessment report
- "The patient's luteal phase progesterone was inadequate at 2.1 ng/mL, suggesting luteal insufficiency." — Reproductive endocrinology consultation