FSH (Follicle Stimulating Hormone)
A blood test measuring FSH levels to assess fertility, menopause, and reproductive hormone function in males and females.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
What this test measures
Follicle-stimulating hormone (FSH) is produced by the pituitary gland and plays a central role in reproductive function for both sexes. In women, FSH drives the early stages of follicle development in the ovaries each menstrual cycle, stimulating a cohort of follicles to grow and preparing the dominant follicle's egg for ovulation. In men, FSH works alongside luteinizing hormone (LH) to support testosterone production in the testes and is essential for healthy sperm development.
FSH levels follow a predictable pattern over the reproductive lifespan. In women, testing is typically performed on cycle day 2 or 3, when baseline levels are most diagnostically useful. As ovarian reserve (the remaining pool of eggs) diminishes with age, the pituitary gland compensates by releasing more FSH in an attempt to stimulate follicle growth, which is why rising FSH levels over time are associated with declining fertility. Lower baseline FSH generally reflects stronger ovarian function, while persistently elevated FSH suggests diminished ovarian reserve. In men, FSH helps evaluate sperm production capacity and testicular function.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals experiencing fertility challenges or difficulty conceiving after trying for several months
- Women with irregular menstrual periods, missed periods, or changes in cycle length that may indicate hormonal imbalances
- Those approaching menopause or perimenopause who want to understand hormonal changes and reproductive status
- Individuals suspected of having polycystic ovary syndrome (PCOS) or other reproductive hormone disorders
- Males with concerns about sperm production, low testosterone symptoms, or reproductive health issues
- Anyone with symptoms of early or delayed puberty, or pituitary gland dysfunction
What to expect
Preparation
No fasting is required for the FSH test. For females, timing can be important - the test is typically performed on days 2-3 of the menstrual cycle for the most accurate results. Individuals taking high-dose biotin supplements should stop consumption at least 72 hours before the test, as biotin may interfere with results.
Sample Type
This test requires a simple blood draw from a vein in the arm, similar to routine blood work.
Collection
A trained phlebotomist will collect the blood sample at the laboratory. The process typically takes just a few minutes and involves minimal discomfort.
Turnaround
Results are typically available within 1-2 business days after the sample reaches the laboratory.
Understanding your results
Normal FSH ranges differ by sex, age, and menstrual cycle phase. In reproductive-age women, follicular-phase FSH typically falls between approximately 1.4 and 9.9 mIU/mL, rising during the mid-cycle ovulatory surge to approximately 6.2 to 17.2 mIU/mL (when both FSH and LH peak to trigger egg release), then returning to approximately 1.1 to 9.2 mIU/mL during the luteal phase. Reference ranges vary between laboratories, so results should be compared to the specific ranges on the lab report. Healthcare providers interpret FSH alongside age, AMH, estradiol, symptoms, and reproductive goals to assess ovarian reserve and overall reproductive function.
| Population | Reference Range | Notes |
|---|---|---|
| Adult Males | 1.3-19.3 IU/L | Relatively stable levels throughout adult life |
| Adult Females - Follicular Phase | 3.9-8.8 IU/L | Measured on days 1-5 of menstrual cycle |
| Adult Females - Mid-cycle | 4.5-22.5 IU/L | Peak levels occur around ovulation |
| Adult Females - Luteal Phase | 1.8-5.1 IU/L | Lower levels after ovulation |
| Postmenopausal Females | >16 IU/L (often 25-135 IU/L) | Significantly elevated levels after menopause |
Reference ranges shown are general guidelines. Your lab report will include the specific reference range used by the laboratory that processed your sample, which is the authoritative range for interpreting your results.
What does a “Low” result mean?
In adults, low FSH can signal an issue with the pituitary gland or hypothalamus, affecting the hormone's production. Low FSH levels may be seen in individuals with polycystic ovary syndrome (PCOS), where women may ovulate irregularly or not at all. In children, low levels of FSH may be a sign of delayed puberty. Low FSH in females also may be associated with being underweight or extreme exercise. Both FSH and LH are typically low in pituitary or hypothalamic failure. Low FSH levels may indicate that the reproductive system is not receiving proper hormonal signals to function normally.
What does a “High” result mean?
Higher-than-normal FSH levels are often a sign of an issue in the ovaries or testes (gonads). When the gonads cannot create enough estrogen, testosterone, or inhibin, the normal feedback loop is disrupted and both FSH and LH levels rise. In females, high FSH levels can indicate menopause, PCOS, or other reproductive health conditions. For women, FSH levels typically rise until they reach 40 mIU/mL or higher during menopause. FSH is also used to diagnose premature ovarian failure when it is elevated above the 40 mIU/mL threshold before the normal age for menopause. In males, high FSH may be associated with tumors, genetic conditions, or testicular dysfunction.
Privacy & confidentiality
All test orders are authorized and results reviewed by an independent, board-certified physician who is not the patient's personal doctor. LevelPanel takes patient privacy seriously and maintains strict confidentiality of all test results. Your FSH test results are <u>not reported to your doctor</u> unless you choose to share them, and they are <u>not part of your medical records</u> with any healthcare provider. The test and results will <u>not appear on insurance statements</u> or explanation of benefits (EOB) forms, ensuring complete discretion. All test results are delivered securely through your private LevelPanel account, accessible only with your login credentials. We do not share your information with employers, insurance companies, or any third parties without your explicit consent. This direct-to-consumer testing approach gives you complete control over your reproductive health information, allowing you to make informed decisions about when and with whom to share your FSH levels. No doctor visit is required to order this test, providing you with convenient and private access to important fertility and reproductive health insights.
Frequently asked questions
Related tests
LH (Luteinizing Hormone)
Works together with FSH to control reproductive function and is often tested simultaneously
View TestEstradiol
Primary estrogen hormone that works in feedback loops with FSH to regulate menstrual cycles
View TestAMH (Anti-Müllerian Hormone)
Another marker of ovarian reserve often tested with FSH for comprehensive fertility assessment
View TestTestosterone (Total)
Important for male reproductive health and often tested with FSH in fertility evaluations
View TestRelated conditions
Related articles
Last reviewed: April 2026
CPT Code: 83001
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
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