Table 2.

Definitions of menstrual function.⁹³

Menstrual Status	Definition
Eumenorrhea	Menstrual cycles at intervals near the median for young adult women (28 ± 7 days)
Amenorrhea	Primary: No menses by age 15 years in the presence of normal secondary sexual development or within 5 years after breast development if that occurs before the age of 10
	Secondary: Loss of menses for ≥ 90 days after menarche
Anovulation	Absence of ovulation usually due to impaired follicular development
Luteal-phase defect	An asymptomatic condition caused by a shortened luteal phase (< 11 days) and/or a low concentration of progesterone
Oligomenorrhea	Menstrual cycles at intervals > 35 days