Follicle-stimulating hormone (FSH) blood test

What is Follicle Stimulating Hormone (FSH)?

Follicle Stimulating Hormone (FSH) is a hormone naturally produced in the body, which helps to regulate the reproductive system. In women, FSH signals the ovaries to produce eggs, and in men, it helps regulate the production of sperm. A FSH blood test is used to measure the level of the hormone in a patient's body.

What is FSH Blood Test?

A FSH blood test is usually done to help diagnose and treat fertility, menstrual, and hormone-related issues. The test measures the level of FSH in the body and can give insight into problems like ovarian failure or polycystic ovary syndrome (PCOS). It could also indicate if someone is going through menopause. The FSH test can help doctors diagnose the cause of infertility, and whether hormone therapy may help treat it.

Preparing for an FSH Blood Test

No special preparation is needed for an FSH test. It is important to inform the doctor of any medications being taken, as certain drugs such as birth control pills or anti-inflammatory drugs can affect results.The lab technician will take a blood sample, usually from the arm, by making a small cut and collecting the sample using a needle.

Types of FSH Blood Tests

  • Follicle Stimulating Hormone Test (FSH)
  • Day 3 FSH Test
  • Mid-Luteal FSH Test
  • Early Menopause FSH Test

Risks of an FSH Blood Test

Having a blood test is generally safe and does not carry many risks. The blood sample is usually taken from a vein in the arm, so some patients may experience some pain or bruising. Additionally, infection or excessive bleeding can occur at the site of the puncture.

Interpreting FSH Blood Test Results

A normal FSH level is between 10 to 20 mIU/mL. However, age and time of the month can influence resting levels. Generally, FSH levels vary significantly with each menstrual cycle and are highest in the first few days. Higher than normal levels of FSH may indicate menopause, ovarian failure, or some other hormonal problems. Lower-than-normal levels may indicate a pituitary gland problem or polycystic ovarian disease. It is important to interpret the results in the context of the individual's overall health.

When to Have an FSH Blood Test?

An FSH blood test may be recommended by a doctor when someone is experiencing infertility, menopausal symptoms, or irregular menstrual periods. An FSH test could also be recommended to men or women if they have been diagnosed with PCOS or an underactive thyroid. Additionally, if someone is taking hormone therapy, an FSH test may be advised to monitor the patient's response to the therapy.


FSH is essential for fertility in both men and women, as it helps regulate the production of eggs and sperm. A FSH blood test measures the level of the hormone in the body, and helps doctors diagnose and treat fertility and hormone-related issues. An FSH blood test is a safe procedure with minimal risks and discomfort. It is important to talk to a doctor about when an FSH blood test is recommended and how to interpret the results.