There is general inconsistency in the nomenclature used to describe abnormal uterine bleeding (AUB) classification system for AUB, which has been approved by the International Federation of Gynecology and Obstetrics (FIGO) Executive Board as a FIGO PALM-COEIN classification system.

1. ABNORMAL UTERINE BLEEDING
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PALM COEIN CLASSIFICATION
AUB-P: Polyp (Uterine or Cervical Polyps)
AUB-A: Adenomyosis
AUB-L: Leiomyoma
AUB-M:
Malignancy/hyperplasia
• Cervical Intraepithelial Neoplasia, Cervical Cancer
• Endometrial Hyperplasia and Uterine Cancers
• Oestrogen-secreting (granulosa cell) ovarian tumours
AUB-C:
Coagulopathy
• Von Willebrand Disease
• Coagulation Factor Deficiencies, e.g., Hypofibrinogenemia,
Haemophilia A and B carriers, Thrombocytopenia
AUB-O:
Ovulation dysfunction
• Hepatic Failure (AUB is present in 60% of these patients):
• AUB is caused by ovulation dysfunction (abnormal oestrogen
metabolism), coagulation factor deficiency (secondary to diminished
synthesis), and thrombocytopenia (secondary to portal
hypertension)
• Chronic Renal Failure (80% of patients requiring dialysis): ovulatory
dysfunction is due to disturbance of pulsatile GnRH secretion
Endocrinopathies, e.g., hypothyroidism, adrenal disorders, polycystic
ovary syndrome, hyperprolactinemia, obesity,
AUB-E:
Endometrial
dysfunction
• Atrophic endometritis, e.g., postmenopausal
AUB-I:
Iatrogenic
• Exogenous hormones, e.g., hormonal contraceptives, steroids
• Intrauterine devices
AUB-N:
Not otherwise specified
• Müllerian anomalies, e.g., didelphys, septate and bicornuate uterus
• Arteriovenous malformation (congenital or acquired)
• Cesarean scar defect