FSH (Follicle Stimulating Hormone) in Serum
This test measures the amount of follicle-stimulating hormone (FSH) in your blood, which plays a key role in hormone regulation, particularly in reproductive health.
["FSH helps control egg and sperm production and supports hormone balance."]
Key facts at a glance
- LOINC
- 70254-8
- Short code
- FSH IgG Ser IA-aCnc
- Synonyms
- FSH IgG Ser IA-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
- ia
- 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
Why This Test Might Be Ordered
Your doctor may recommend this test if you have symptoms or conditions related to hormone imbalances, such as irregular menstrual cycles, infertility, or signs of early menopause. It may also be used to monitor conditions like polycystic ovary syndrome (PCOS) or to check for hormonal disorders in both men and women.
What to Expect Before the Test
No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the blood draw if your lab requires it. Wear comfortable clothing and plan to rest afterward, as you might feel lightheaded.
What Happens During the Test
A healthcare provider will insert a small needle into a vein in your arm to draw blood. You may feel a brief pinch, but the process is quick. The blood sample is then sent to a lab for analysis.
What the Results Mean
Results are interpreted based on your age, sex, and medical history. High or low FSH levels can indicate underlying health concerns, such as thyroid issues, kidney problems, or reproductive system disorders. Your doctor will discuss the results with you in detail.
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 levels can signal reproductive health issues, such as ovulation disorders in women or low sperm production in men. It may also help diagnose conditions like premature ovarian insufficiency (POI) or hypogonadism. Always consult your doctor for personalized interpretation.
Short name
FSH Level
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