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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 women and sperm production in men.

Quick summary

FSH levels indicate reproductive health and 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
interpretation: {"text":"May indicate pituitary or hypothalamic dysfunction, or problems with the ovaries or testes.","label":"Low FSH"}; {"text":"Suggests diminished ovarian reserve in women or impaired sperm production in men.","label":"High FSH"}

Follicle-Stimulating Hormone (FSH) is essential for the development and maturation of ovarian follicles in women and for sperm production in men. It is a key indicator of reproductive health and fertility potential.

In women, elevated FSH levels may suggest diminished ovarian reserve or menopause, while low levels could indicate issues with the pituitary gland or hypothalamus. In men, abnormal FSH levels can affect sperm production and quality.

The normal reference range for FSH levels is typically between 3.5 and 12.5 mIU/mL. Deviations from this range can provide valuable diagnostic information for clinicians in assessing fertility issues and guiding treatment plans.

Frequently asked questions

What is a normal FSH level?
Normal FSH levels typically range from 3.5 to 12.5 mIU/mL.
How is FSH testing used in fertility assessment?
FSH testing helps evaluate ovarian reserve in women and sperm production in men, aiding in fertility assessments.
  1. 1
    Mayo Clinic: FSH TestSource
  2. 2
    American College of Obstetricians and Gynecologists: Infertility WorkupSource

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.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

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