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Menstrual Cycle
Periodic uterine bleeding in response to cyclic hormonal changes. Starts from day 1 of a period to day 1 of the next (average 28 days, range 23–35 days).
Menarche
First menstrual period (average onset at age 12–13). Ushers reproductive capability.
Menopause
Permanent cessation of the menstrual cycle.
Onset
Average 12–13 years (Menarche).
Cycle Interval
Average 28 days (Normal range: 23–35 days).
Duration
Average 2–7 days (Range: 1–9 days).
Duration
Average 2–7 days (Range: 1–9 days).
Amount
Average 30–80 ml.
Heavy bleeding: saturates a sanitary pad in < 1 hour.
Color / Composition
Dark red; contains blood, mucus, and endometrial cells.