Normal menstruation: Occurs every ~28d (range 24-38d), usually w/predictable duration (8 days or less) & quantity of bleeding; Avg age menarche US:12-13 ; Avg age menopause US: 51;
Quantify excessive bleeding by number of pads change over 24h, degree to which they're saturated, clots observed, etc.
Broad categories for AUB can also be defined by acronym PALM-COEIN, with PALM covering structural etiologies and COEIN non-structural
PALM-COEIN applies to non-pregnant women who are menstruating (i.e. not applicable for patients who are pre-menarche or post menopausal)
Polyps, Adenomyosis, Leiomyoma (fibroids), Malignancy (vagina, cervix, uterus), Coagulopathy (inherited or acquired bleeding disorders), Ovarian dysfunction (non-ovulatory or ovulating irregularly), Endometrial disorders (failure of local hemostasis, related to inflammation or other processes), Iatrogenic (contraceptives, anti-coagulants), Not yet classified