FSH (Follicle-Stimulating Hormone)
What is it?
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.
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.
This information is for educational purposes and does not replace medical advice.
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