We use the STRAW (Stages of Reproductive Aging Workshop) framework, the clinical gold standard for reproductive aging, enhanced with our proprietary algorithm that incorporates your unique cycle, hormone, symptom, and age data. Source: Harlow, S.D. et al. (2012). Executive summary of the Stages of Reproductive Aging Workshop + 10. Menopause, 19(4), 387–395. doi:10.1097/gme.0b013e31824d8f40