In a typical 28-day menstrual cycle, the follicular phase occurs during which days?

• A. Cycle days 7-14
• B. Cycle days 14-28
• C. Cycle days 1-6
• D. Cycle days 1-13

Answer: (D)

The question tests understanding of when the follicular phase happens in a typical cycle. The follicular phase starts with the first day of the cycle—the first day of menstrual bleeding—and lasts as the follicles in the ovary mature and estrogen rises to prepare the uterus. In a 28-day cycle, ovulation typically occurs around day 14, so the follicular phase covers the first half of the cycle, usually day 1 through day 13. The luteal phase then begins after ovulation and lasts about 14 days. Therefore, the best span for the follicular phase is the early part of the cycle before ovulation.