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Follicle Stimulating Hormone (FSH) in Serum

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

This blood test measures the levels of follicle-stimulating hormone, a hormone produced by the pituitary gland that plays a key role in reproductive health.

Quick summary

["FSH helps regulate the menstrual cycle and sperm production."]

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

Key facts at a glance

LOINC
1473-8
Short code
FSH 30M p 100 ug LRH IV SerPl-mCnc
Synonyms
FSH 30M p 100 ug LRH IV SerPl-mCnc
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 Is This Test Done?

Your healthcare provider may order this test to evaluate fertility issues in both men and women, assess hormonal imbalances, diagnose conditions like polycystic ovary syndrome (PCOS), or monitor treatment for hormone-related disorders.

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 blood is drawn early in the morning. Avoid strenuous activity or excessive stress on the day of testing.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but the process is quick and typically painless. The blood sample will be sent to a lab for analysis.

What Are Possible Results?

Results are interpreted based on your age, sex, and medical history. High or low FSH levels may indicate underlying health 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.

Clinical Significance: FSH Levels and Health Implications

Short name

FSH Serum

Frequently asked questions

How often will I need this test?
FSH testing is often done once or multiple times depending on your symptoms or medical needs. Your doctor will determine the frequency based on your diagnosis and treatment plan.
What if my results are outside the normal range?
If your FSH levels are elevated or low, your doctor may recommend additional tests or treatments to address potential hormonal imbalances, fertility issues, or other conditions affecting your reproductive health.
Can lifestyle changes affect FSH levels?
Yes, factors like stress, diet, weight, and certain medications can influence hormone levels. Maintaining a healthy lifestyle and discussing your medications with your healthcare provider can help 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