Sex hormones
Follicle-stimulating hormoneFSH
Drives ovarian follicle development and Sertoli-cell spermatogenesis support.
Sample
Serum
Clinical reference range
3.5 to 12.5 IU/L
Follicular
Conv: 3.5–12.5 IU/L
Biology
What it measures
Pulsatile under GnRH control; follicular phase elevations recruit dominant follicle.
Clinical use
Why we order it
Ovarian reserve estimation (day 3), menopause confirmation, infertility workup.
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