How do you manage monitoring menopausal status for a premenopausal patient with DCIS on tamoxifen who would likely become post-menopausal during therapy?

Monitoring menopausal status in premenopausal women on tamoxifen is relatively easy, even if the tamoxifen interrupts their menstrual cycles, or they have had a hysterectomy but still have at least 1 ovary. Since tamoxifen doesn't lower estrogen levels the way aromatase inhibitors do, you can simply...