# Eumenorrheic

Eumenorrheic describes a person with regular menstrual cycles, usually 21 to 35 days long, who is not using hormonal contraception.

Researchers use the word to describe study participants whose cycles are regular enough to compare phases. Studies of eumenorrheic women do not tell you what happens with irregular cycles, hormonal contraception, pregnancy or menopause.

Also called: eumenorrhoeic.

Related: [Menstrual cycle phases](https://revns.com/dictionary/menstrual-cycle-phases.md)

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