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FSH (Follicle-Stimulating Hormone) in Serum or Plasma

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

This test measures the amount of follicle-stimulating hormone in your blood. FSH plays a key role in reproductive health, affecting both men and women.

Quick summary

["FSH helps regulate hormone production and sperm/egg development."]

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

Key facts at a glance

LOINC
12671-4
Short code
FSH sp9 p chal SerPl-sCnc
Synonyms
FSH sp9 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)?

FSH is a hormone produced by the pituitary gland that helps control the reproductive system. In women, it stimulates the growth of follicles in the ovaries, which eventually release eggs. In men, it supports sperm production. Levels of FSH can vary depending on your age, health, and reproductive status.

Why Might You Need This Test?

Doctors may order an FSH test to evaluate fertility issues, hormone imbalances, or conditions affecting the ovaries or testes. It can also help diagnose conditions like polycystic ovary syndrome (PCOS), premature ovarian insufficiency, or hypogonadism.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. You may feel a small pinch, but it usually doesn’t cause significant discomfort. The sample is sent to a lab for analysis.

What Does the Test Result Mean?

Results are interpreted based on your sex, age, and medical history. High or low FSH levels may indicate underlying health concerns that require further evaluation by a healthcare provider.

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.

◆Associated findings1

Short name

FSH Level

Frequently asked questions

How often will I need this test?
FSH testing frequency depends on your medical needs. Some patients may need it once, while others may require follow-up tests over time to monitor changes in hormone levels or treatment progress.
What are the typical reference ranges for FSH?
Reference ranges vary by sex, age, and lab. For women, they may differ between premenopausal and postmenopausal stages, while men’s ranges are generally consistent. Your doctor will provide your specific results and compare them to your unique situation.
Can lifestyle factors affect FSH levels?
Yes, lifestyle choices such as diet, exercise, stress levels, and smoking can influence hormone production. Maintaining a balanced lifestyle may support healthy hormone function, but your doctor should assess any changes in your results.
  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