FSH & LH (Fertility Hormones) Test
Category
Hormones
Specimen
Blood
Organ System
—
Available At
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About FSH & LH (Fertility Hormones) Test
FSH (Follicle-Stimulating Hormone) and LH (Luteinizing Hormone) are two hormones produced by the pituitary gland that together regulate the reproductive system in both men and women, controlling processes from egg and sperm production to hormone release from the ovaries and testes.
In women, FSH stimulates the growth of ovarian follicles that will eventually release an egg, while LH triggers ovulation itself — their levels rise and fall in a predictable pattern throughout the menstrual cycle, which is why the timing of blood collection matters so much for accurate interpretation.
In men, these same hormones regulate sperm production and testosterone release from the testes, making the FSH/LH panel equally relevant to male fertility evaluation.
Because these hormones sit at the top of the reproductive hormonal cascade, abnormal levels can point toward problems ranging from the ovaries or testes themselves to issues originating higher up in the pituitary gland or brain.
When Should You Get FSH & LH (Fertility Hormones) Test
This test is ordered for:
- Difficulty conceiving, in either partner
- Irregular, absent, or unusually heavy menstrual cycles
- Suspected menopause or perimenopause
- Evaluating low testosterone or reduced sperm count in men
- Investigating suspected pituitary or hypothalamic gland disorders
Conditions FSH & LH (Fertility Hormones) Test Can Detect
FSH and LH testing helps evaluate:
- Infertility, in both men and women
- Polycystic ovary syndrome (PCOS)
- Menopause and ovarian reserve
- Pituitary or hypothalamic gland disorders affecting reproductive hormones
How to Prepare for FSH & LH (Fertility Hormones) Test
- For women, timing relative to your menstrual cycle matters significantly — your doctor will typically specify testing on day 2, 3, or 4 of your cycle for a baseline reading.
- No fasting is usually required.
- Inform your doctor of any hormonal medications or contraceptives you're taking, since these can significantly affect results.
FSH & LH (Fertility Hormones) Test Normal Reference Ranges
Ranges vary considerably by cycle phase, sex, and age.
| Parameter | Normal Range |
|---|---|
| FSH (women, follicular phase) | 3.5–12.5 mIU/mL |
| LH (women, follicular phase) | 2.4–12.6 mIU/mL |
| FSH (men) | 1.5–12.4 mIU/mL |
A high FSH in women, particularly alongside irregular periods, often suggests declining ovarian reserve or approaching menopause, while abnormal patterns in men can point toward either a testicular problem or a pituitary-related issue, depending on how LH and testosterone levels align.
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Frequently Asked Questions About FSH & LH (Fertility Hormones) Test
Why does cycle day matter for women taking this test?
FSH and LH levels change substantially through the menstrual cycle, so testing on the wrong day can give a misleading result — your doctor will typically specify day 2 to 4 for a standard baseline assessment.
Can men have this test too?
Yes, FSH and LH are equally relevant for evaluating male fertility and testicular function, and testing isn't limited to women.
What does a high FSH level suggest in women?
A persistently elevated FSH, especially with irregular periods, often suggests reduced ovarian reserve and can be an indicator of approaching menopause or a fertility challenge worth discussing with a specialist.
Medical Disclaimer: This page is for informational purposes only and does not constitute medical advice. Lab test results should always be interpreted by a qualified healthcare professional in the context of your clinical history. Do not self-diagnose or alter your treatment based on test results alone.
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