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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 plays a key role in hormone regulation, particularly in reproductive health for both men and women.

Quick summary

["FSH helps manage fertility and hormone balance, often checked if reproductive issues or hormonal imbalances are suspected."]

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

Key facts at a glance

LOINC
48571-4
Short code
FSH D11 SerPl-aCnc
Synonyms
FSH D11 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 Is Done

Doctors may order an FSH test to evaluate reproductive function, diagnose conditions like infertility, early menopause, or hormonal disorders. It can also help assess conditions affecting the pituitary gland or ovaries/testes.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the blood draw if your lab requires it. Wear a loose shirt for easy access to your arm.

How the Test Is Performed

A healthcare provider will insert a needle into a vein (usually in your arm) to collect blood. You may feel a brief pinch, but the process is quick and painless.

Possible Results and Interpretation

Results are compared to your age and sex-specific reference ranges. High or low FSH levels may signal underlying health concerns, but interpretation depends on your medical history and symptoms.

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

What Does an Abnormal FSH Level Mean?
An abnormal FSH level doesn’t have a single cause. It could relate to reproductive aging, hormonal imbalances, or conditions like polycystic ovary syndrome (PCOS) in women or low testosterone in men. Your doctor will explore possible reasons with your symptoms and medical history.
Frequency depends on your health needs. Some people get FSH tested once during fertility evaluation, while others may have follow-up tests if symptoms persist or change over time. Your doctor will determine the best schedule for you.
Diet and exercise can influence overall hormone balance but don’t directly alter FSH levels. However, maintaining a healthy weight and managing stress may indirectly support reproductive health. Always follow your doctor’s advice for lifestyle adjustments.
Is There Any Risk or Side Effect?
The risk of complications from blood draws is low. Possible minor side effects include bruising, slight pain, or a small bump at the injection site. If you experience excessive bleeding or swelling, contact 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