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FSH (Follicle Stimulating Hormone) with Serum/Plasma Specimen, Immunoassay Method

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

This test measures the levels of follicle-stimulating hormone (FSH) in your blood, which plays a key role in hormone regulation related to reproductive health.

Quick summary

["FSH helps determine reproductive function and may be checked for fertility issues or hormonal imbalances."]

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

Key facts at a glance

LOINC
27864-8
Short code
FSH sp9 p chal SerPl-aCnc
Synonyms
FSH sp9 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?

FSH is primarily used to assess reproductive health in both men and women. In women, it helps evaluate ovarian function and can be checked during fertility evaluations, menstrual cycle irregularities, or signs of perimenopause. In men, it supports the assessment of testosterone production and sperm health.

When Might You Need This Test?

Your healthcare provider may order an FSH test if you experience symptoms like irregular periods, difficulty conceiving, early menopause signs, low libido, or if you have concerns about hormonal imbalances affecting fertility.

How Is the Test Performed?

A blood sample is drawn from a vein, typically in your arm. The sample is then sent to a lab where it is analyzed using an immunoassay method to measure FSH levels accurately.

What Do Results Mean?

Results can vary based on individual health, age, and medical history. High or low FSH levels may indicate underlying conditions affecting reproductive function, but interpretation requires professional 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 Can Indicate Reproductive Health Issues

Short name

FSH (Serum/Plasma)

Frequently asked questions

Why was this test ordered for me?
Your doctor may have ordered this test to check for fertility problems, hormonal imbalances, or signs of conditions like early menopause, ovarian dysfunction, or low testosterone in men.
What are typical reference ranges for FSH?
Reference ranges can differ by lab and age. For women, they may vary during different life stages (e.g., premenopausal vs. postmenopausal). For men, reference ranges are generally consistent but may be adjusted based on specific health conditions.
Can lifestyle factors affect FSH levels?
Yes, factors like stress, diet, weight, and certain medications can influence hormone levels, including FSH. Maintaining a healthy lifestyle and discussing medications with your doctor can help ensure accurate results.
  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