General
Follicle-Stimulating Hormone (FSH)
Lab test

FSH Test

Recommended for women investigating fertility, ovarian reserve, or menopausal transition, and for men being evaluated for reproductive concerns. In women still menstruating, testing on day 2–3 of the cycle provides the most useful result. No fasting required. Results reviewed by a General Medicine clinician.

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What is an FSH Test?

The FSH test measures follicle-stimulating hormone — produced by the pituitary gland to drive egg development in women and sperm production in men. FSH is one of the most informative hormones for evaluating reproductive health, menstrual irregularity, menopausal transition, and fertility — both because of what elevated levels indicate and what normal levels can rule out.

Ovarian reserve and fertility assessment

In women, FSH measured on day 2–3 of the menstrual cycle reflects how hard the pituitary is working to stimulate the ovaries. A rising FSH suggests declining ovarian reserve — a key marker in fertility evaluation that guides timing and treatment decisions.

Menopausal transition confirmation

Consistently elevated FSH — particularly above 25–30 IU/L combined with absent periods — is one of the primary hormonal indicators of menopause. It helps explain symptoms and supports clinical decision-making about hormone therapy.

Male reproductive evaluation

In men, elevated FSH indicates impaired sperm production at the testicular level — helping distinguish between primary testicular failure and other causes of male infertility, and guiding appropriate specialist referral and treatment options.

Complete insights in as little as 48 hours

1

Book your test

Instantly schedule at 2,000+ labs nationwide, at a time that works for you. Most visits take 15 minutes or less, with both walk-ins and appointments available.

2

Get results in 48 hours

Your results are delivered quickly—and reviewed by medical professionals. You’ll get clear explanations, robust health insights, and recommended next steps tailored to your health needs.

3

Take action with physician guidance

Choose to review your results and manage your plan with a General Medicine physician—or simply use the insights on your own.

4

Track progress over time

Repeat annually to see trends, improvements, and new emerging risks or book individual tests that focus on your set goals

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We help you understand your options, connect you to the right clinicians, manage prescriptions, coordinate any needed evaluations, and keep an eye on your overall health along the way. It’s comprehensive care that looks at the full picture — your goals, your history, your lifestyle — and makes it simple to move forward with confidence.

Your care plan
Clinician

What's included

Test type

Blood sample

Collection method

Venipuncture

Fasting

Not required

Results processing time

1 to 2 days

FSH (Follicle Stimulating Hormone)

FSH regulates the function of the ovaries and testes, including egg and sperm production. Abnormal levels can indicate issues with fertility, hormone balance, or reproductive organ function.

Virtual visit with clinician

Ongoing support, always available.

You’ll be supported by experienced clinicians who care for a wide range of health needs, from everyday concerns to more complex conditions.

Our clinicians track your progress over time and adjust your care as needed. If medication is prescribed, we’ll manage dosing and monitor for side effects. If lab testing is recommended, we review results and refine your plan accordingly. You’re never left to navigate care on your own.

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Frequently asked questions

What does the FSH test measure and why does it matter?

FSH (follicle-stimulating hormone) is produced by the pituitary gland and stimulates ovarian follicle development in women and sperm production in men. In women, elevated FSH — particularly on day 2–3 of the cycle — is one of the most important markers for ovarian reserve and menopausal transition.

When should I have my FSH tested?

In women still menstruating, FSH is most informative when tested on days 2–3 of the menstrual cycle for fertility and ovarian reserve assessment. If cycles are irregular or absent, testing can be done at any time. In men, timing is not cycle-dependent.

Do I need to fast for an FSH test?

No fasting is required. FSH levels are not affected by recent food intake. You can eat and drink normally before your appointment.

What does a high FSH mean in women?

Elevated FSH on day 2–3 of the cycle suggests the pituitary is working harder to stimulate ovaries that are responding less efficiently — indicating reduced ovarian reserve or approaching menopause. Consistently elevated FSH (above 25–30 IU/L in the absence of a period) combined with low estradiol is consistent with menopause.

Can FSH testing confirm I'm in perimenopause?

FSH fluctuates significantly during perimenopause and a single result is not diagnostic. Perimenopause is a clinical diagnosis based on symptoms and history. However, a pattern of rising FSH over time, particularly combined with falling estradiol and irregular periods, supports the clinical picture.