Follicle-Stimulating Hormone (FSH)
Also known as: FSH · follitropin
The pituitary hormone that grows ovarian follicles and supports sperm development in the testes.
FSH acts on the Sertoli cells of the testes, which nurse developing sperm, and on the granulosa cells of ovarian follicles. Together with LH it completes the signal the gonads need for fertility.
In clinical fertility research, FSH activity is the variable that most influences follicle growth and the later stages of sperm production.
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RELATED TERMS
Luteinising Hormone (LH)
The pituitary hormone that tells the testes to make testosterone and triggers ovulation in women.
HPG Axis (Hypothalamic–Pituitary–Gonadal Axis)
The hormone loop from hypothalamus (GnRH) to pituitary (LH, FSH) to gonads (testosterone, oestradiol, sperm or eggs).
Spermatogenesis
The roughly three-month process by which the testes produce mature sperm, driven by FSH and high testosterone inside the testes.
Semen Parameters
The measured features of a semen sample: volume, concentration, total count, motility and morphology, read against WHO reference ranges.
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