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FSH (Follicle-Stimulating Hormone)

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The Follicle-Stimulating Hormone (FSH) test measures the level of FSH in your blood. FSH is a crucial hormone produced by the pituitary gland, playing a vital role in reproductive health for both men and women. In women, FSH stimulates the growth of ovarian follicles before the release of an egg at ovulation and helps regulate the menstrual cycle. In men, FSH is essential for sperm production. Excessive FSH and LH are found in conditions like hypogonadism, anorchia, gonadal failure, complete testicular feminization syndrome, menopause, Klinefelter syndrome, alcoholism, and after castration. FSH and LH are products of the pituitary gland, useful in differentiating primary gonadal failure from secondary (hypothalamic/pituitary) causes of gonadal failure, menstrual disturbances, and amenorrhea. It is also useful for defining menstrual cycle phases in the infertility evaluation of women and for assessing testicular dysfunction in men. FSH is commonly used with LH, which is also a gonadotropin. Both are typically low in cases of pituitary or hypothalamic failure. FSH and LH levels are high following menopause.

Quick facts

Sample type

Serum (preferred) or plasma

Turnaround

2–4 business days

Fasting

No Fasting Required

Doctor’s order included

Licensed physician review and requisition included with every test.

FSH (Follicle-Stimulating Hormone)

  • Women's Health
  • Men's Health
  • General Health & Wellness
    • Cpt Codes
    • 83001 (per specimen)

    what is FSH (Follicle-Stimulating Hormone) and why is it important?

    The Follicle-Stimulating Hormone (FSH) test measures the level of FSH in your blood. FSH is a crucial hormone produced by the pituitary gland, playing a vital role in reproductive health for both men and women. In women, FSH stimulates the growth of ovarian follicles before the release of an egg at ovulation and helps regulate the menstrual cycle. In men, FSH is essential for sperm production. Excessive FSH and LH are found in conditions like hypogonadism, anorchia, gonadal failure, complete testicular feminization syndrome, menopause, Klinefelter syndrome, alcoholism, and after castration. FSH and LH are products of the pituitary gland, useful in differentiating primary gonadal failure from secondary (hypothalamic/pituitary) causes of gonadal failure, menstrual disturbances, and amenorrhea. It is also useful for defining menstrual cycle phases in the infertility evaluation of women and for assessing testicular dysfunction in men. FSH is commonly used with LH, which is also a gonadotropin. Both are typically low in cases of pituitary or hypothalamic failure. FSH and LH levels are high following menopause.
    • If you are a woman experiencing irregular periods, no periods (amenorrhea), or have been trying to conceive without success.
    • If you are a woman experiencing symptoms commonly associated with menopause, such as hot flashes, night sweats, vaginal dryness, or mood changes.
    • If you are a man experiencing symptoms of low testosterone, such as decreased libido, erectile dysfunction, fatigue, or loss of muscle mass, or if you have concerns about male infertility.
    • If your healthcare provider suspects a problem with your pituitary gland or your gonads (ovaries in women, testes in men).
    • As part of a comprehensive fertility workup for both men and women, often ordered alongside other reproductive hormones.
    • Individuals experiencing difficulties conceiving or with fertility concerns.
    • Women with irregular menstrual cycles, amenorrhea (absence of periods), or symptoms related to menopause or perimenopause.
    • Men experiencing symptoms of testicular dysfunction, such as low libido, erectile dysfunction, or infertility concerns.
    • Anyone investigating the cause of hormonal imbalances, particularly those related to pituitary gland or gonadal (ovarian/testicular) function.
    • Patients undergoing fertility treatments or hormone therapy, for monitoring treatment effectiveness and progress.

    Commonly Used For Diagnosis Of

    The FSH test is a critical diagnostic tool used to investigate a range of conditions related to reproductive and endocrine health:

    • Infertility in both men and women, helping to pinpoint issues with ovarian function or sperm production.
    • Irregular menstrual cycles, amenorrhea (absence of periods), and symptoms associated with menopause or premature ovarian failure in women.
    • Low testosterone, erectile dysfunction, and other signs of testicular dysfunction in men.
    • Disorders of the pituitary gland or hypothalamus, as FSH levels can indicate whether the problem lies in the gonads themselves or in the brain's signaling to them.
    • Conditions like hypogonadism, where the body produces little or no sex hormones, or anorchia, the absence of one or both testes.
    • Certain genetic conditions affecting reproductive development, such as Klinefelter syndrome.
    • Monitoring the effectiveness of hormone replacement therapy or fertility treatments.

    Caution

    It is important to remember that hormone levels can fluctuate due to various factors, including stress, medication, and the natural pulsatile release of hormones. The interpretation of your FSH test results should always be done by a qualified healthcare provider in conjunction with your overall health status, symptoms, medical history, and other diagnostic findings. This test provides valuable information, but it is one piece of a complete clinical picture. Do not make any medical decisions based solely on these results without professional medical advice.

    Frequently Ordered Together

    How It Works?

    1
    Add Your Test to Cart and Check out

    once Test Order is received, Our physicians will review your request and email you the easy-to-follow requisition form.

    2
    Locate and Visit Your Nearest Laboratory

    Find the closest partner location—most are within 2–3 miles—and drop by for a quick, no‑appointment blood draw.

    3
    Get your Results Online

    Once your sample is processed, we’ll send your report straight to your inbox within 1–3 business days. Just click the link to view your results anytime.

    4
    Book a Optional Consult

    Have Questions about results? Book a phone or video visit with one of our doctors. They’ll walk you through your report, explain any findings, and recommend next steps