The FIGO Ovulatory Disorders Classification System†

Area of Science:

• Reproductive Endocrinology
• Gynecology
• Medical Classification Systems

Background:

• Ovulatory disorders are common causes of infertility, amenorrhea, and abnormal uterine bleeding, often linked to Polycystic Ovary Syndrome (PCOS).
• Existing classification systems, like the WHO's, are outdated and do not incorporate recent research or technological advancements.
• The lack of a consensus classification hinders research, education, and clinical care for ovulatory dysfunction.

Purpose of the Study:

• To introduce a new, comprehensive classification system for ovulatory disorders developed under the International Federation of Gynecology and Obstetrics (FIGO).
• To provide a standardized framework that facilitates research, education, and clinical management of ovulatory dysfunction.
• To replace the outdated WHO classification with a more current and detailed system.

Main Methods:

• A rigorous Delphi process involving international experts, specialty societies, and patient representatives was employed.
• The process included two face-to-face meetings and five rounds of expert consultation.
• The new system was developed based on stakeholder consensus and expert input.

Main Results:

• A three-level, multi-tiered classification system for ovulatory disorders was established.
• The primary level uses an anatomic model (Hypothalamus, Pituitary, Ovary) plus PCOS (HyPO-P).
• Second and third levels incorporate mnemonics like GAIN-FIT-PIE for detailed categorization of causes and specific diagnostic entities.

Conclusions:

• The new FIGO classification system offers a structured approach to ovulatory disorders, improving clarity for clinicians, researchers, and educators.
• Widespread adoption of this system is expected to enhance understanding, diagnosis, and treatment of ovulatory dysfunction.
• The system includes a mechanism for periodic reevaluation and revision to reflect evolving knowledge.