Table 1.

FIGO (Fédération Internationale de Gynécologie et d’Obstétrique) classification of menstrual bleeding disorders (From: Ref. 25).

Term	Classification	Definition
Disturbances of regularity	Irregular menstrual bleeding Absent menstrual bleeding	> 20 days in individual cycle lengths over a period of 1 year. No bleeding in a 90-day period.
Disturbances of frequency	Infrequent menstrual bleeding Frequent menstrual bleeding	One or two episodes in a 90-day period More than four episodes in a 90-day period.
Disturbances of heaviness of flow	Heavy menstrual bleeding Light menstrual bleeding	Excessive menstrual blood loss which can occur alone or in combination with other symptoms. This is based on complaint by the patient.
Disturbances of the duration of flow	Prolonged menstrual bleeding Shortened menstrual bleeding	Menstrual periods that exceed 8 days in duration on a regular basis. Menstrual bleeding of no longer than 2 days in duration.
Irregular non-menstrual bleeding		Irregular episodes of bleeding, often light and short, occurring between otherwise fairly normal menstrual periods.