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FSH (Follicle Stimulating Hormone) - Serum Concentration

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 control fertility and hormone production."]

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

Key facts at a glance

LOINC
12660-7
Short code
FSH 3h p chal SerPl-sCnc
Synonyms
FSH 3h 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

What Is Follicle-Stimulating Hormone (FSH)?

Follicle-stimulating hormone (FSH) is a hormone produced by the pituitary gland, which sits at the base of your brain. In women, FSH helps develop eggs in the ovaries and stimulates the production of estrogen. In men, FSH supports sperm production in the testes. FSH levels can vary depending on your age, reproductive status, and health conditions.

Why Might You Need This Test?

Doctors may order an FSH test to evaluate fertility issues, check for hormonal imbalances, diagnose conditions like polycystic ovary syndrome (PCOS), or assess symptoms of menopause or premature ovarian insufficiency. It can also help monitor certain cancers or thyroid disorders.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to measure the concentration of FSH. The test typically takes a few days to return results.

What Do the Results Mean?

Results are interpreted based on your age, sex, and medical history. Elevated or low FSH levels can indicate different health concerns, so your doctor will discuss the results with you in the context of your overall health.

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.

Clinical Significance

Short name

FSH

Frequently asked questions

Why do some people experience fluctuations in FSH levels?
FSH levels naturally fluctuate throughout the menstrual cycle in women and change with age. Hormonal imbalances, thyroid disorders, kidney disease, or certain medications can also affect FSH levels. If your doctor suspects an underlying condition, they may recommend further testing or evaluation.
What are the typical reference ranges for FSH?
Reference ranges can vary by lab and individual factors like age and sex. For women, premenopausal levels may differ from postmenopausal levels. For men, reference ranges are generally consistent, but they can still vary slightly. Your doctor will provide specific guidance based on your results.
Can lifestyle factors, such as diet or exercise, impact FSH levels?
While diet and exercise can influence overall hormone health, they do not typically cause significant fluctuations in FSH levels on their own. However, certain dietary deficiencies or chronic stress may indirectly affect hormonal balance. Always discuss lifestyle changes with your healthcare provider.
  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