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NORMAL MENSTRUATION
Cyle length: marked variability in women not using
oral contraceptives.
5
th-95th centile being 23 – 39.4 days.
Mean duration 29.6 days.
Cycle length decreases with advancing age.
Abnormal menstruation: bleeding at any time outside
normal menstruation and any variation outside the
defined limits.
Acyclical bleeding – pre or postmenopausal bleeding.
