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Follicle-stimulating hormone (FSH) blood test

Follicle stimulating hormone; Menopause - FSH; Vaginal bleeding - FSH

The follicle stimulating hormone (FSH) blood test measures the level of FSH in blood. FSH is a hormone released by the pituitary gland, located on the underside of the brain.

How the Test is Performed

A blood sample is needed.

How to Prepare for the Test

If you are a woman of childbearing age, your health care provider may want you to have the test done on certain days of your menstrual cycle.

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or a slight bruise. This soon goes away.

Why the Test is Performed

In women, FSH helps manage the menstrual cycle and stimulates the ovaries to produce eggs. The test is used to help diagnose or evaluate:

In men, FSH stimulates production of sperm. The test is used to help diagnose or evaluate:

In children, FSH is involved with the development of sexual features. The test is ordered for children:

Normal Results

Normal FSH levels will differ, depending on a person's age and sex.

Male:

Female:

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test result.

What Abnormal Results Mean

High FSH levels in women may be present:

Low FSH levels in women may be present due to:

High FSH levels in men may mean the testicles are not functioning correctly due to:

Low FSH levels in men may mean parts of the brain (the pituitary gland or hypothalamus) do not produce normal amounts of some or all of its hormones.

High FSH levels in boys or girls may mean that puberty is about to start.

Risks

There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight, but may include:

Related Information

Hypopituitarism
Klinefelter syndrome
Polycystic ovary syndrome
Turner syndrome
Premature ovarian failure
Abnormal uterine bleeding
Multiple endocrine neoplasia (MEN) I
Ovarian cysts

References

Garibaldi LR, Chemaitilly W. Disorders of pubertal development. In: Kliegman RM, St Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 578.

Jeelani R, Bluth MH. Reproductive function and pregnancy. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 23rd ed. St Louis, MO: Elsevier; 2017:chap 25.

Lobo RA. Infertility: etiology, diagnostic evaluation, management, prognosis. In: Lobo RA, Gershenson DM, Lentz GM, Valea FA, eds. Comprehensive Gynecology. 7th ed. Philadelphia, PA: Elsevier; 2017:chap 42.

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Review Date: 6/30/2019  

Reviewed By: John D. Jacobson, MD, Professor of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda Center for Fertility, Loma Linda, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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