Skip to content

Follicle Stimulating Hormone (FSH), Serum

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

This blood test measures the amount of follicle-stimulating hormone (FSH) in your serum. 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 assess 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
1476-1
Short code
FSH 75M p 100 ug LRH IV SerPl-mCnc
Synonyms
FSH 75M 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 Might You Need This Test?

Your doctor may order an FSH test to evaluate fertility issues, hormone imbalances, or conditions affecting the ovaries or testes. It can also help diagnose conditions like polycystic ovary syndrome (PCOS), premature ovarian insufficiency, or hypogonadism.

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 it’s part of a larger panel. Bring any medications you’re currently taking to your appointment.

What Happens During the Test?

A healthcare provider will draw blood from a vein in your arm. The blood sample will be sent to a lab for analysis. The process takes about 15 minutes, and you may feel slight discomfort but no lasting effects.

What the Results Mean

Results are interpreted based on your age, sex, and medical history. High or low FSH levels can indicate underlying health concerns, so discuss your results with your doctor.

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 plays a critical role in reproductive function. Elevated levels may suggest conditions like ovarian reserve depletion, while low levels could indicate pituitary disorders or other hormonal imbalances. Regular monitoring may be needed for ongoing fertility or endocrine evaluations.

Short name

FSH Level

Frequently asked questions

How often should I get an FSH test?
The frequency depends on your medical needs. Your doctor may recommend periodic testing if you have fertility concerns, hormonal symptoms, or a history of reproductive issues. Follow-up testing is often scheduled based on individual health goals and doctor guidance.
What are typical reference ranges for FSH?
Reference ranges vary by lab and individual factors like age and sex. For women, ranges typically span 3–30 IU/L in the follicular phase, but values can differ across cycles. For men, ranges are often 1.5–12 IU/L. Your doctor will interpret results in the context of your specific situation.
Can lifestyle changes affect FSH levels?
Yes, lifestyle factors such as stress, diet, weight, and smoking can influence hormone levels. Maintaining a balanced diet, managing stress, and avoiding smoking may support healthy hormone function. Always discuss lifestyle adjustments with your healthcare provider before making changes.
  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