What is the duration of the luteal phase in the menstrual cycle?

• A. Days 15 - 20
• B. Days 19 - 24
• C. Days 22 - 28
• D. Days 1 - 14

Answer: (C)

The luteal phase of the menstrual cycle typically lasts from ovulation until the start of menstruation, spanning approximately 14 days. This phase is characterized by the presence of the corpus luteum, which forms after the follicle releases an egg. The luteal phase usually begins around day 15, following ovulation, and can extend to around day 28, just before the menstrual cycle resets with the onset of menstruation.

Thus, the choice indicating the duration from days 22 to 28 correctly reflects the latter part of the luteal phase, as it encompasses the final days leading up to the next menstrual period. This period is crucial for implantation if fertilization occurs, as the corpus luteum secretes progesterone, supporting the uterine lining for potential pregnancy.

Understanding the duration of each phase in the menstrual cycle helps in tracking ovulation and fertility, which is important for reproductive health and family planning.