Skip to content

Follicle Stimulating Hormone (FSH) - 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.

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
1468-8
Short code
FSH 105M p 100 ug LRH IV SerPl-mCnc
Synonyms
FSH 105M 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

What Is FSH Used For?

FSH levels are often checked to evaluate reproductive function, especially in women experiencing irregular periods, infertility, or menopause-related symptoms. In men, it helps assess issues like low sperm production or hormonal imbalances.

How Is This Test Performed?

A blood sample is taken from a vein, usually in your arm. The blood is then sent to a lab for analysis using an immunoassay method to measure FSH levels accurately.

When Might You Need This Test?

Your healthcare provider may recommend an FSH test if you have symptoms like missed periods, difficulty getting pregnant, early menopause signs, or unexplained infertility. Men might have it checked for low testosterone or fertility concerns.

What Do My Results Mean?

Results can vary based on age, sex, and health status. High or low FSH levels may indicate conditions like polycystic ovary syndrome (PCOS), ovarian failure, or hypogonadism. Your doctor will interpret results in the context of 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.

Clinical Significance: FSH plays a critical role in reproductive health. Elevated levels may signal early menopause, ovarian dysfunction, or other hormonal disorders. Low levels can indicate pituitary gland issues or conditions affecting hormone production, such as hypopituitarism.

Short name

FSH Serum

Frequently asked questions

Why do I need this test if I’m not pregnant or trying to conceive?
Even if you’re not actively trying to conceive, FSH testing can help identify underlying hormonal imbalances that might affect fertility later. It’s also useful for diagnosing conditions like PCOS or evaluating symptoms of perimenopause.
What if my FSH levels are outside of the typical range?
If your results are outside the expected range, your doctor will discuss potential causes with you, such as thyroid issues, genetic factors, or other health conditions. They may recommend further testing or adjustments to treatment plans.
Can lifestyle changes affect FSH levels?
Yes, factors like stress, poor sleep, obesity, and certain medications can influence hormone levels. Maintaining a healthy lifestyle—including balanced nutrition, regular exercise, and stress management—may support overall hormonal health.
  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