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FSH (Follicle-Stimulating Hormone) with Serum/Plasma Concentration Measurement

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of follicle-stimulating hormone (FSH) in your blood. FSH plays a key role in regulating reproductive hormones in both men and women.

Quick summary

["FSH helps balance reproductive health and may be checked if fertility issues or hormonal imbalances are suspected."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
12661-5
Short code
FSH 10M p chal SerPl-sCnc
Synonyms
FSH 10M p chal SerPl-sCnc
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 This Test Is Done

Your doctor may order an FSH test to evaluate reproductive function, diagnose conditions like infertility, evaluate hormone imbalances, or assess conditions affecting the pituitary gland or ovaries/testes.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the blood draw if your lab requires it. Wear comfortable clothing for easy access to your arm.

How the Test Works

A small needle will draw blood from a vein in your arm. The sample is then sent to a lab to measure FSH levels using a blood test method (likely immunoassay).

Possible Results and Interpretation

Results are compared to a general reference range, but individual ranges can vary by lab. High or low FSH levels may signal conditions like early menopause, polycystic ovary syndrome (PCOS), or hypogonadism.

Reference range

Follicular: 3.5-12.5 mIU/mLN/A

Specimen: serum

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 often indicates reduced ovarian/testicular function, such as in perimenopause or premature ovarian insufficiency. Low FSH may suggest pituitary disorders or other hormonal deficiencies. Always discuss results with your healthcare provider for personalized insights.

Short name

FSH Level

Frequently asked questions

What causes abnormal FSH levels?
Abnormal FSH levels can result from conditions like hormonal imbalances, pituitary tumors, genetic disorders, or aging-related changes. Other factors, such as certain medications or chronic illnesses, may also influence results.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Your doctor will contact you once they are ready.
Can lifestyle changes affect FSH test results?
Yes, stress, extreme weight changes, or certain medications may temporarily alter FSH levels. Follow your doctor’s instructions for optimal test timing.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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