Table 1.

Bleeding Patterns

Normal: The normal interval is 21 to 35 days. The normal duration of bleeding is 1 to 7 days. The amount should be less than 1 pad or tampon per 3-hour period
Severe acute bleeding: Bleeding that requires more than one pad/tampon per hour or vital signs indicating hypovolemia.
Irregular bleeding: Includes metrorrhagia, menometrorrhagia, oligomenorrhea, prolonged bleeding, intermenstrual bleeding, or other irregular pattern.
Menorrhagia: Heavy but regular cyclic bleeding plus >7 days of bleeding or clots or iron deficiency anemia. Prolonged bleeding >12 days should be considered irregular regardless of cyclic pattern.