FSH (Follicle-Stimulating Hormone)
FSH from the pituitary stimulates the ovaries (follicle development) and testes (spermatogenesis). It is often interpreted with LH, estradiol, or testosterone depending on sex and clinical question.
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Normal ranges
Highly context-dependent. Women: low in mid-cycle suppression; rises in menopause (often >25–30 IU/L, lab-specific). Men: commonly about 1–12 IU/L — use your report’s interval.
Units: IU/L
Causes of deviations
Low levels:
Hypogonadotropic hypogonadism, pituitary disorders, excess sex steroids.
High levels:
Primary ovarian insufficiency or menopause in women; primary testicular failure in men; some genetic conditions.
When to see a doctor
For fertility evaluation, delayed puberty, suspected menopause, irregular cycles, or low testosterone symptoms — seek specialist evaluation.
Related biomarkers
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