Follicle Stimulating Hormone (FSH) – Serum or Plasma
This test measures the levels of follicle-stimulating hormone in your blood, which plays a key role in regulating reproductive function in both men and women.
["FSH helps control hormone production and sperm/egg development."]
Key facts at a glance
- LOINC
- 1471-2
- Short code
- FSH 1h p GnRH SerPl-mCnc
- Synonyms
- FSH 1h p GnRH SerPl-mCnc
- 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)?
FSH is a hormone produced by the pituitary gland, a small pea-sized structure at the base of your brain. In women, it helps regulate the menstrual cycle and supports the development of eggs in the ovaries. In men, FSH stimulates sperm production in the testes. Abnormal FSH levels may indicate issues with fertility, hormonal imbalances, or other reproductive health concerns.
Why Might You Need This Test?
Doctors may order an FSH test to evaluate fertility problems, assess hormonal imbalances, diagnose conditions like polycystic ovary syndrome (PCOS), or check for pituitary gland disorders. It can also help monitor treatment for hormone-related conditions.
Sample Collection and Preparation
This test requires a blood sample drawn from a vein in your arm. You may be asked to fast for a few hours before the test, though this is not always necessary. A healthcare provider will explain the process and any preparations needed.
What to Expect During the Test
The blood draw is quick and typically painless. You may feel a slight pinch or discomfort, but most people tolerate it well. Afterward, you can resume normal activities, though you may experience mild bruising or soreness at the injection site.
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.
Elevated FSH levels in women may suggest early menopause, ovarian dysfunction, or conditions like PCOS. Low FSH could indicate pituitary disorders, hypothyroidism, or other hormonal deficiencies. In men, abnormal FSH levels may signal issues with sperm production or testicular problems. Always discuss results with your healthcare provider for personalized interpretation.
Short name
FSH
Frequently asked questions
How long does it take to get my FSH test results?
Can lifestyle changes affect my FSH levels?
Is fasting required for this test?
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