Which cycle day range corresponds to the proliferative stage?

Which cycle day range corresponds to the proliferative stage?

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

Answer: (A)

The proliferative phase is when the endometrium rebuilds and thickens under the influence of rising estrogen from the developing follicles. This estrogen-driven growth prepares the lining for possible implantation after ovulation. In a typical 28-day cycle, this proliferative window runs roughly from day 7 to day 14, ending as ovulation occurs around day 14. Days 1-6 correspond to menstruation with shedding of the lining, while days 14-28 reflect the secretory phase driven by progesterone after ovulation. Days 1-14 span menstruation and part of proliferation, so the pure proliferative phase best aligns with day 7-14.

The proliferative phase is when the endometrium rebuilds and thickens under the influence of rising estrogen from the developing follicles. This estrogen-driven growth prepares the lining for possible implantation after ovulation. In a typical 28-day cycle, this proliferative window runs roughly from day 7 to day 14, ending as ovulation occurs around day 14. Days 1-6 correspond to menstruation with shedding of the lining, while days 14-28 reflect the secretory phase driven by progesterone after ovulation. Days 1-14 span menstruation and part of proliferation, so the pure proliferative phase best aligns with day 7-14.