What is the best way to diagnose menopause?
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No single test for menopause is highly sensitive and specific. The best predictors that a woman will enter menopause within 4 years include age at least 50 years, amenorrhea for 3 to 11 months, and menstrual cycle irregularity within 12 months (strength of recommendation [SOR]: B; based on multiple prospective cohort studies). For diagnosing perimenopause, the level of follicle-stimulating hormone (FSH) is most useful for clinical situations in which the pretest probability, as based on history, is midrange (SOR: B, based on 1 systematic review and 2 cross-sectional studies).
Journal of Family Practice, 54(11) 2005: 1000-1002.