Follicle-Stimulating Hormone (FSH): About This Test

What is it?

This test measures the amount of follicle-stimulating hormone (FSH) in a blood sample. This hormone is made by the pituitary gland. FSH helps control the menstrual cycle and the production of eggs by the ovaries. It also helps control the production of sperm by the testicles.

Why is this test done?

The amount of FSH is measured to:

• Help find the cause of infertility.

• Help diagnose menstrual problems.

• See why a child is going through early or delayed puberty.

• Help diagnose certain pituitary gland problems, such as a tumor.

How do you prepare for the test?

Up to 4 weeks before the test, you may be asked to stop taking birth control pills or other medicines that contain estrogen or progesterone.

What happens during the test?

A health professional uses a needle to take a blood sample, usually from an arm. Sometimes more than one blood sample may be needed. A sample may be taken each day for several days in a row.

How long does the test take?

The test will take a few minutes.

What happens after the test?

• You will probably be able to go home right away, depending on the reason for the test.

• You can go back to your usual activities right away.

Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor if you are having problems. It's also a good idea to keep a list of the medicines you take. Ask your doctor when you can expect to have your test results.

Current as of: May 13, 2023

Content Version: 14.0

Care instructions adapted under license by your healthcare professional. If you have questions about a medical condition or this instruction, always ask your healthcare professional. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.