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Abnormal Uterine Bleeding (Aub)

Any uterine bleeding outside the normal volume, duration, regularity or frequency is considered abnormal uterine bleeding (AUB).


Normal Menstruation

Cycle interval

28 days (21-35 days)

Menstrual flow

4-5 days

Menstrual blood loss

35 mL (20-80 mL)

In order to create an universally accepted nomenclature to describe abnormal uterine bleeding, International federation of Gynecology and obstetrics (FIGO) and American College of Obstetricians and Gynaecologists (ACOG) introduced newer systems of terminology to describe AUB.

The newer classification systems is known by the acronym PALM-COEIN. It is used to classify the abnormal uterine bleeding on the basis of etiology. Polyp, adenomyosis, leiomyoma, maligancncy and coagulopathy, hyperplasia, ovulatory dusfunction, endometrial, iatrogenic and not yet classifiend are the different etiological factors expressed by one (or more) letters.

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