FSH (Follicle Stimulating Hormone) in Serum
This test measures the level of follicle-stimulating hormone (FSH) in your blood, which plays a key role in hormone regulation, particularly in reproductive health.
["FSH helps track reproductive function and may signal issues in hormone balance or fertility."]
Key facts at a glance
- LOINC
- 25652-9
- Short code
- FSH sp9 p chal SerPl IRP2-aCnc
- Synonyms
- FSH sp9 p chal SerPl IRP2-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 3.5
- Ref high
- 12.5
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- nd-irp
- CPT
- 83001
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What Is FSH Used For?
FSH is primarily measured to evaluate reproductive health, especially in women experiencing irregular menstrual cycles, menopause symptoms, or fertility challenges. In men, it helps assess testosterone production and potential issues with sperm development. Doctors may also use it to monitor conditions like polycystic ovary syndrome (PCOS) or hypogonadism.
When Might You Need This Test?
You might have this test if you’re experiencing symptoms like missed periods, infertility, low libido, or early signs of menopause. Men could have it if they’re struggling with low testosterone or fertility problems. Your doctor may also order it as part of a broader hormone evaluation.
What Does a Result Mean?
Results can vary based on age, sex, and health status. Higher-than-normal levels may suggest early menopause, ovarian dysfunction, or certain pituitary disorders. Lower-than-normal levels could indicate hypogonadism or other hormonal imbalances. Always discuss your specific result with your healthcare provider.
Common Reasons for Testing
Doctors often order FSH tests to diagnose or monitor conditions like ovarian reserve decline (in women), low sperm count (in men), or hormonal imbalances affecting fertility or menopause progression.
Reference range
Follicular: 3.5-12.5 mIU/mLN/A
For females: inform if menstrual cycle status. For certain tests, timing within menstrual cycle may matter.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
FSH plays a critical role in regulating reproductive hormones. In women, it stimulates follicle development in the ovaries, while in men, it supports sperm production. Abnormal levels can indicate underlying health concerns that may require further evaluation or treatment.
Short name
FSH Serum
Frequently asked questions
Why do I need this test if I’m not pregnant or trying to conceive?
What should I expect during or after the blood draw?
Could diet or exercise affect my FSH levels?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy