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FSH (Follicle Stimulating Hormone) - Serum, Mass Concentration

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

This test measures the amount of follicle-stimulating hormone (FSH) in your blood. FSH is a hormone produced by the pituitary gland that plays a key role in reproductive health, including egg and sperm development.

Quick summary

["FSH helps regulate fertility and hormone balance in both men and women."]

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

Key facts at a glance

LOINC
50480-3
Short code
FSH sp4 SerPl-aCnc
Synonyms
FSH sp4 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 this test if you have symptoms related to reproductive health, such as irregular periods, infertility, or signs of early menopause. It may also be used to monitor conditions like polycystic ovary syndrome (PCOS) or to check for hormonal imbalances in men experiencing low testosterone.

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 test if your lab requires it. Bring any medications you’re currently taking to your appointment.

What the Test Involves

A blood sample will be drawn from a vein in your arm by a healthcare professional. This process is quick and typically causes only mild discomfort.

What the Results Mean

Results are interpreted based on your age, sex, and medical history. High or low FSH levels can indicate underlying health issues, such as hormonal disorders or conditions affecting reproductive function.

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 Serum

Frequently asked questions

How often should I get this test?
FSH levels may be checked periodically if you’re undergoing fertility treatment, managing hormonal conditions, or experiencing symptoms like irregular periods, low libido, or early signs of menopause. Your provider will determine the best timing based on your needs.
What do my FSH results indicate about my fertility?
Elevated FSH levels in premenopausal women may suggest declining ovarian reserve or early menopause. In men, low FSH could indicate issues with testosterone production or other hormonal imbalances. Always discuss results with your healthcare provider for personalized interpretation.
Can lifestyle changes affect FSH levels?
Yes, factors like stress, weight fluctuations, and certain medications can influence hormone levels. Maintaining a healthy lifestyle, managing stress, and avoiding smoking may support balanced hormone function.
  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