when a woman has not had a
menstrual period for 12 months. However, since you had a
hysterectomy 20
years ago, this is not an option. Instead, a blood test known as a follicle stimulating hormone (or FSH) test may be used in conjunction with your symptoms to better assess whether you are transitioning into menopause. That said, there might be other reasons for hot flashes and night sweats and it's best to speak with your personal physician.