lab metric
Follicle-Stimulating Hormone (FSH)
Table of contents
Description
FSH (follicle-stimulating hormone) is produced by the pituitary gland and helps regulate reproductive function. In females, FSH stimulates ovarian follicles and supports estrogen production. In males, FSH supports sperm production by acting on Sertoli cells in the testes.
Why it matters
FSH is often used to understand where a reproductive hormone issue may be coming from:
If the gonads (ovaries/testes) are underperforming, the pituitary often “turns up the signal,” raising FSH.
If the pituitary/hypothalamus is suppressed, FSH can be inappropriately low.
Interpreting higher vs lower FSH (general education)
Higher FSH (female): can suggest reduced ovarian reserve or menopausal transition (interpret with age and cycle timing).
Higher FSH (male): can suggest primary testicular dysfunction affecting spermatogenesis.
Lower FSH: can be seen with hypothalamic/pituitary suppression (stress, under-fueling, illness), or with exogenous hormones depending on context.
Context matters
FSH is highly dependent on menstrual cycle phase in premenopausal women. It’s usually interpreted alongside LH, estradiol, testosterone (in males), and symptoms/history.
Educational only, not medical advice. Fertility and hormone interpretation should be individualized and reviewed with a clinician.
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