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FSH (Follicle Stimulating Hormone) in Serum/Plasma

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 hormone regulation, particularly in reproductive health.

Quick summary

["FSH helps control fertility and hormone production in both men and women."]

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

Key facts at a glance

LOINC
56592-9
Short code
FSH 10M p chal SerPl-aCnc
Synonyms
FSH 10M p chal 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

Why This Test Might Be Ordered

Your healthcare provider may recommend an FSH test to evaluate reproductive function, diagnose hormonal imbalances, or assess conditions like infertility, early menopause, or pituitary disorders. It may also be used to monitor certain treatments for hormone-related conditions.

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 blood draw if your lab requires it. Wear comfortable clothing and plan to stay near the testing site for a short time.

What the Test Involves

A healthcare professional will collect a blood sample from a vein in your arm. You may feel a slight pinch, but the process is quick and typically painless. The sample is 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 different health concerns, so your provider will discuss findings 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: FSH Levels and Health Conditions

Short name

FSH Level

Frequently asked questions

What are the typical reference ranges for FSH?
Reference ranges vary by age, sex, and lab. For women, FSH levels rise with age and can indicate early menopause or ovarian dysfunction. In men, abnormal FSH may suggest issues with testosterone production or other hormonal imbalances.
How does FSH differ between men and women?
In women, FSH primarily regulates the menstrual cycle and egg development. In men, it supports sperm production. Your provider will consider your sex when interpreting results.
Can lifestyle factors affect FSH levels?
Yes, factors like stress, weight, smoking, and certain medications can influence FSH levels. If you suspect lifestyle changes are affecting your results, discuss them 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