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FSH (Follicle Stimulating Hormone) – Serum, Quantitative

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 function in both men and women.

Quick summary

["FSH helps balance hormone activity in your reproductive system."]

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

Key facts at a glance

LOINC
55478-2
Short code
FSH 4h p chal SerPl-aCnc
Synonyms
FSH 4h 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

What Is FSH Used For?

FSH is primarily measured to assess reproductive health, especially in diagnosing conditions affecting egg production in women or sperm production in men. It can also help evaluate conditions like infertility, early menopause, or hormonal imbalances.

Who Might Need This Test?

Doctors may order an FSH test if you have symptoms like irregular periods, difficulty getting pregnant, low sex drive, or signs of early menopause. It’s also used in men to check for issues with testosterone production or sperm quality.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it’s analyzed to measure FSH levels. Results are typically available within 1–3 business days.

What Do My Results Mean?

Results are compared to a general reference range, but individual results can vary based on age, sex, and health status. High or low FSH levels may signal underlying conditions that need further evaluation.

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

Why was my FSH test ordered?
Your doctor may have recommended this test to investigate fertility issues, hormonal imbalances, or symptoms related to reproductive health. Common reasons include irregular periods, difficulty conceiving, or signs of early menopause in women, or low testosterone concerns in men.
How often should I get this test?
The frequency depends on your symptoms, medical history, and doctor’s recommendations. Some people may need retesting after treatment or during follow-up visits for conditions like infertility or hormonal disorders.
Can lifestyle changes affect FSH levels?
Yes, factors like stress, weight changes, smoking, alcohol use, or certain medications can influence hormone levels. Maintaining a healthy lifestyle and discussing these factors with your doctor may help optimize 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