Follicle-stimulating hormone (FSH) concentration in serum/plasma
This test measures the amount of follicle-stimulating hormone (FSH) in your blood. FSH is a hormone produced by the pituitary gland that plays a key role in reproductive health, including egg and sperm development.
["FSH helps regulate fertility and hormone balance in both men and women."]
Key facts at a glance
- LOINC
- 1475-3
- Short code
- FSH 45M p 100 ug LRH IV SerPl-mCnc
- Synonyms
- FSH 45M p 100 ug LRH IV 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
Why Is This Test Done?
Doctors may order an FSH test to evaluate fertility issues, assess hormone imbalances, diagnose conditions like polycystic ovary syndrome (PCOS), or check for pituitary gland problems. It can also help monitor hormone therapy or identify signs of early menopause.
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 test if it involves drawing blood from a vein. If you’re taking medications that affect hormones, let your healthcare provider know.
How the Test Is Performed
A healthcare professional will insert a needle into a vein (typically in your arm) to draw blood. You may feel a small pinch, but the procedure is quick and usually painless. 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 signal underlying health concerns, but your doctor will discuss findings with you in the context of your overall health.
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.
Clinical Significance: FSH Levels and Health
Short name
FSH (Serum/Plasma)
Frequently asked questions
What Are Common Questions About This Test?
Can lifestyle factors (like diet or exercise) affect FSH levels? Yes, stress, weight fluctuations, and certain medications can influence hormone levels, including FSH.
How often should I get an FSH test? Frequency depends on your symptoms, age, and medical needs. Your doctor will determine the best timing for retesting.
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