Once oestrogen levels in the bloodstream drop to about one half, menstruation ceases and the habitual cyclic ups and downs of the menses are replaced by a steadier hormonal balance.

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Quizplus · Accepted Answer

Menstruation ceases when estrogen levels drop significantly, typically during menopause, not when they drop by half. The cessation of menstruation is due to the end of ovarian follicular activity, not a reduction to half of estrogen levels.

Once Oestrogen Levels in the Bloodstream Drop to About One