The PALM-COEIN system is a classification framework for abnormal uterine bleeding (AUB) that replaces older descriptive terms (menorrhagia, metrorrhagia, polymenorrhea, oligomenorrhea) with standardized categories distinguishing structural causes (Polyp, Adenomyosis, Leiomyoma, Malignancy/hyperplasia) from non-structural causes (Coagulopathy, Ovulatory dysfunction, Endometrial, Iatrogenic). This concept belongs to gynecology/reproductive medicine and formalizes the etiologic classification of AUB based on normal menstrual cycle parameters (21–35 day intervals, ~25–30 mL average blood loss) to guide diagnosis of the underlying cause.
The PALM-COEIN system is a classification framework for abnormal uterine bleeding (AUB) that replaces older descriptive terms (menorrhagia, metrorrhagia, polymenorrhea, oligomenorrhea) with standardi…