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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 and is important for both men and women.

Quick summary

["FSH helps manage fertility and hormone balance in both genders."]

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

Key facts at a glance

LOINC
21278-7
Short code
FSH 45M p GnRH SerPl-aCnc
Synonyms
FSH 45M p GnRH SerPl-aCnc
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 production of eggs in women and sperm in men. It also plays a role in maintaining reproductive function and bone health. Levels can vary based on age, reproductive status, and health conditions.

Why Might You Need This Test?

Doctors may order an FSH test to evaluate fertility issues, assess hormone imbalances, diagnose conditions like polycystic ovary syndrome (PCOS), or check for hormonal disorders in both men and women.

Who Might Require an FSH Test?

Common reasons include unexplained infertility, irregular menstrual cycles in women, low sperm counts in men, or symptoms of hormonal imbalances such as missed periods, early menopause, or delayed puberty.

What Does an FSH Test Tell You?

High or low FSH levels can indicate problems with the pituitary gland, ovaries (in women), or testes (in men). It can also help identify conditions affecting reproductive health, such as ovarian reserve depletion 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 levels may suggest diminished ovarian reserve (common in perimenopause or early menopause), while low levels could indicate pituitary dysfunction or other hormonal imbalances. In men, abnormal FSH may signal issues with sperm production or testicular function.

Short name

FSH Level

Frequently asked questions

How Is This Test Performed?
A blood sample is taken from a vein, usually in your arm. You may feel a small pinch when the needle is inserted, but the process is quick and typically painless. No special preparation is usually needed, but your doctor may advise fasting or avoiding certain activities.
Will I Feel Any Discomfort?
Most people experience only minor discomfort or a brief sting during the blood draw. Some may feel slight bruising or tenderness at the site, but these are usually mild and resolve quickly. You can return to normal activities immediately afterward.
How Long Will Results Take?
Test results are usually available within 1 to 3 business days, depending on your lab. Your healthcare provider will discuss the results with you and explain any findings or next steps.
  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