In a thorough menstrual history, which element is typically assessed?

• A. Cycle length and regularity
• B. Height and weight
• C. Sleep patterns
• D. Family history

Answer: (A)

Focusing on the pattern of menstruation—cycle length and regularity—provides the most direct insight into ovulatory function and hormonal balance. Cycle length is the number of days from the first day of one period to the day before the next period, with typical adult cycles ranging roughly 21 to 35 days. Regularity describes whether cycles occur in a predictable, month-to-month pattern. Regular, predictable cycles usually indicate regular ovulation and stable hormonal control, while irregular or highly variable cycles can signal anovulation or endocrinologic issues such as PCOS, thyroid disease, or hyperprolactinemia. Other aspects like flow, duration, symptoms, and pregnancy potential are important too, but cycle length and regularity are the element most central to a thorough menstrual history.