Abnormal Uterine Bleeding (Dysfunctional Uterine Bleeding) By JoAnn V Pinkerton, MD, University of Virginia Health System Reviewed / Revised Jan 2023 View Patient Education Pathophysiology Etiology Symptoms and Signs Diagnosis Treatment Key Points Topic Resources PALM-COEIN classification... Normal Menstrual Parameters * Abnormal uterine bleeding (AUB) in patients of reproductive age is a bleeding pattern that is not consistent with normal menstrual cycle parameters (frequency, regularity, duration, and volume).