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Follicle-Stimulating Hormone (FSH)

Published: July 27, 2026Updated: August 25, 2026

FSH is a hormone produced by the pituitary gland that plays a crucial role in reproductive processes by stimulating the growth of ovarian follicles in females and sperm production in males.

Quick summary

FSH is essential for reproductive health, with levels indicating fertility status.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
mIU/mL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche FSH, Abbott FSH, Siemens FSH, Beckman FSH
interpretation: {"text":"May indicate pituitary or hypothalamic disorders, or anorexia.","label":"Low FSH"}; {"text":"Suggests diminished ovarian reserve in women or testicular failure in men.","label":"High FSH"}

Follicle-Stimulating Hormone (FSH) is a gonadotropin that stimulates the growth and maturation of ovarian follicles in women and supports sperm cell production in men. It is critical for the regulation of the menstrual cycle and fertility.

In women, FSH levels fluctuate throughout the menstrual cycle, with higher levels indicating diminished ovarian reserve or menopause. In men, consistently high or low FSH levels may suggest issues with sperm production or testicular function.

Measuring FSH is often part of infertility evaluations and can help diagnose conditions such as polycystic ovary syndrome (PCOS), hypogonadism, and pituitary disorders. Normal FSH levels are typically between 3.5–12.5 mIU/mL.

Frequently asked questions

What is a normal FSH level?
Normal FSH levels range from 3.5 to 12.5 mIU/mL, but this can vary depending on age, gender, and reproductive status.
How is FSH testing used in fertility treatment?
FSH testing helps assess ovarian reserve and guides fertility treatment options by indicating the potential response to ovarian stimulation.
  1. 1
    Mayo Clinic: FSH TestSource
  2. 2
    American College of Obstetricians and GynecologistsSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

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Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy