Is my FSH (Follicle-Stimulating Hormone) normal?
Free blood test checker · Standard + longevity-optimal ranges
What is a normal FSH level?
FSH is produced by the pituitary gland and stimulates ovarian follicle development in women and sperm production in men. Normal range in men is 1.5-12.4 mIU/mL. In women, FSH varies dramatically with the menstrual cycle and menopausal status. Elevated FSH indicates the gonads are underperforming and the pituitary is compensating by producing more FSH.
| Range | Values |
|---|---|
| Standard Reference | 1.5–12.4 mIU/mL |
What causes abnormal FSH levels?
Elevated FSH is caused by primary gonadal failure (premature ovarian insufficiency, menopause, testicular failure), Turner syndrome, Klinefelter syndrome, chemotherapy or radiation damage to gonads, and chronic alcoholism. Low FSH is caused by hypothalamic or pituitary disorders, hyperprolactinemia, anorexia nervosa, extreme stress, and use of GnRH analogs or high-dose androgens.
When should you see a doctor?
See your doctor if FSH is elevated above the reference range for your age and sex, especially if combined with irregular periods, infertility, hot flashes, or low libido. In men, elevated FSH with low testosterone suggests primary hypogonadism. Women under 40 with elevated FSH should be evaluated for premature ovarian insufficiency.
FSH and longevity
FSH is primarily a reproductive hormone, but emerging research suggests broader metabolic implications. A 2017 study in Nature found that blocking FSH in mice reduced body fat and increased bone density independent of sex hormones — suggesting FSH may directly contribute to post-menopausal metabolic changes. Rising FSH in perimenopause precedes and may partially drive the increased cardiovascular risk, bone loss, and visceral fat accumulation that occur around menopause.
Where to get a FSH test
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Related biomarkers
These biomarkers are often tested alongside FSH for a more complete picture.
Frequently asked questions
What is a normal FSH level?
What does high FSH mean for fertility?
Can FSH levels change over time?
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Sources: Reference ranges based on AHA/ACC, ADA, and AACE clinical guidelines. Biological variation data from Ricos/Westgard database. Longevity-optimal ranges reflect targets used by preventive and functional medicine practitioners.
Last reviewed: April 2026. This tool provides general health information and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider about your specific results.