📖 FSH

In Detail

FSH rises at the start of each cycle to recruit follicles. As follicles grow and produce estrogen, FSH decreases (negative feedback). High baseline FSH (day 3 testing) — above 10-15 mIU/mL — may indicate diminished ovarian reserve, meaning fewer eggs remain. FSH testing combined with AMH (Anti-Müllerian Hormone) and AFC provides the most complete picture of ovarian reserve. FSH medications are also used in IVF to stimulate multiple follicle development.