The mnemonic
Menstrual, Proliferative, Secretory
What each word stands for
- MenstrualDays 1 to 5, endometrial shedding
- ProliferativeOestrogen-driven, follicular ovarian phase
- SecretoryProgesterone-driven, luteal ovarian phase
Why it matters clinically
Links endometrial biopsy findings to the timing of ovulation.
Where it stops being reliable
Day numbers vary with cycle length; the luteal phase is the constant 14 days.
Teaching aid, still awaiting independent review. Confirm facts in a standard source.