Normal menstrual bleeding Occurs every 24-38 days with cycle-to-cycle variation of 2-20 days and lasts 4-8 days. Blood loss of 5-80ml which is roughly equivalent to no more than one pad/tampon every 3 hours.13
Abnormal uterine bleeding (AUB) Uterine bleeding that is abnormal in regularity, frequency, volume or duration in a non-pregnant woman.14 The term dysfunctional uterine bleeding is no longer recommended.4
Chronic AUB AUB present for the majority of the last 6 months.15
Acute AUB An episode of heavy bleeding that requires immediate action to prevent further blood loss.15
Heavy menstrual bleeding (HMB) Excessive volume of menstrual bleeding affecting the patient’s quality of life.8-10
Intermenstrual bleeding (IMB) Any bleeding, other than post-coital bleeding, that occurs outside of menstruation.
Postmenopausal bleeding (PMB) Any bleeding that occurs over one year after the last menstrual period.
Post-coital bleeding (PCB) Non-menstrual bleeding that occurs immediately after sexual intercourse.

Learning bite

Normal menstruation occurs roughly every 4 weeks and less than one pad or tampon is needed every 3 hours.
The definition of heavy menstrual bleeding is based less on actual volume, which is difficult to quantify, and more on the affect it has on the woman’s life.

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