/WHAT_IT_IS
FSH is the pituitary signal that drives sperm production in the testes. Like LH, it's suppressed on TRT.
/NORMAL_RANGE
Adult male reference: 1.5–12.4 mIU/mL.
What does high FSH mean?
- +Primary testicular failure.
- +Sertoli cell-only syndrome.
- +Klinefelter syndrome.
What does low FSH mean?
- +Exogenous testosterone, AAS use.
- +Secondary hypogonadism.
/ON_TRT
FSH falls to near-zero on TRT, which is why sperm production crashes and most men become temporarily infertile after 3–6 months of therapy. If preserving fertility matters, hCG plus low-dose hMG or recombinant FSH can maintain spermatogenesis during TRT.
/RELATED
FAQ
/01Will TRT make me infertile?+
TRT suppresses FSH and stops sperm production in most men within 3–6 months. Fertility usually returns within 6–24 months of stopping — but not always, and the data is increasingly mixed on long-term fertility recovery. If kids are on the roadmap, use hCG alongside TRT and bank sperm before starting.
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