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FSH (Follicle Stimulating Hormone) – Serum Immunoassay

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 hormone production and reproductive function in both men and women.

Quick summary

["FSH helps balance hormones that influence fertility and hormone cycles."]

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

Key facts at a glance

LOINC
53147-5
Short code
FSH 2h p chal SerPl-aCnc
Synonyms
FSH 2h 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?

Doctors may order an FSH test to check for hormonal imbalances, especially in people experiencing infertility, irregular menstrual cycles, or symptoms of low hormone levels. It can also help diagnose conditions like polycystic ovary syndrome (PCOS), ovarian insufficiency, or other reproductive health concerns.

Who Might Need This Test?

Common reasons for testing include evaluating fertility issues, assessing hormonal disorders, monitoring conditions like early menopause, or checking for signs of hormonal imbalances in both men and women.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm, and sent to a lab for analysis. The test measures FSH levels in your serum, which is the liquid part of blood without blood cells.

What Do My Results Mean?

Results help doctors determine whether your hormone levels are within a typical range or if they suggest an underlying condition that may need further evaluation or treatment.

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 I asked to have this test?
Your doctor may have recommended this test to assess fertility, check for hormonal imbalances, or investigate symptoms like irregular periods, difficulty getting pregnant, or signs of early menopause.
What are the possible effects of abnormal FSH levels?
Elevated FSH levels may suggest reduced ovarian function, while low levels could indicate hormonal imbalances or other conditions affecting hormone production. Your doctor will discuss these findings with you and may suggest further testing or treatment options.
How often should I get this test?
The frequency depends on your medical needs. Your doctor will determine how often to repeat the test based on your symptoms, diagnosis, or treatment plan.
  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