Follicle-stimulating hormone (FSH) concentration in serum/plasma
This test measures the amount of follicle-stimulating hormone (FSH) in your blood. FSH plays a key role in hormone regulation, particularly in reproductive health.
["FSH helps determine fertility, hormone balance, and potential reproductive issues in both men and women."]
Key facts at a glance
- LOINC
- 57100-0
- Short code
- FSH 30M p GnRH SerPl-aCnc
- Synonyms
- FSH 30M p GnRH SerPl-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
- 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 Follicle-Stimulating Hormone (FSH)?
Follicle-stimulating hormone (FSH) is a hormone produced by the pituitary gland that helps regulate the reproductive system. In women, it stimulates the ovaries to develop eggs, while in men, it supports sperm production. FSH levels can vary depending on age, health, and reproductive status.
Why Might You Need This Test?
Your doctor may order an FSH test to evaluate fertility problems, hormone imbalances, or conditions affecting the ovaries or testes. It can also help diagnose conditions like polycystic ovary syndrome (PCOS), premature ovarian failure, or hypogonadism.
How Is the Test Performed?
A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab for analysis using an immunoassay method to measure FSH levels accurately.
What Do Results Mean?
Results provide a quantitative measure of FSH concentration, which doctors compare to standard reference ranges to assess hormone function. Abnormal levels may indicate underlying health concerns that need further evaluation.
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.
High FSH levels may suggest conditions like early menopause, ovarian dysfunction, or certain cancers. Low FSH levels could indicate pituitary disorders, hormonal imbalances, or other reproductive system issues. Regular monitoring and follow-up with a healthcare provider are essential for interpreting results accurately.
Short name
FSH (Serum/Plasma)
Frequently asked questions
What causes abnormal FSH levels?
How often should I get this test?
Can lifestyle changes affect 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