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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 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, including egg development in women and sperm production in men.

Quick summary

["FSH helps regulate fertility and hormone balance."]

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

Key facts at a glance

LOINC
27869-7
Short code
FSH sp8 p chal SerPl-aCnc
Synonyms
FSH sp8 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 levels are often checked to evaluate reproductive function, diagnose fertility issues, or monitor conditions like polycystic ovary syndrome (PCOS), menopause, or hypogonadism. It can also be used in the evaluation of pituitary gland disorders or hormonal imbalances.

Who Might Need This Test?

Doctors may order an FSH test if you’re experiencing symptoms like irregular periods, difficulty getting pregnant, low libido, or signs of early menopause. It’s also part of routine testing for men with suspected low testosterone or fertility problems.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it’s analyzed using an immunoassay method to measure FSH levels.

What Are Common Results?

Results are typically reported as a numerical value, but reference ranges can vary by lab and individual factors like age, sex, and health status. Your doctor will interpret the results in relation to your specific situation.

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 might my FSH levels be checked during pregnancy or fertility treatments?
FSH is sometimes monitored during fertility treatments, such as IVF, to ensure proper hormone regulation. It can also be checked in early pregnancy to assess ovarian reserve or rule out conditions like ovarian insufficiency.
What if my FSH levels are higher or lower than expected?
Elevated FSH may suggest early menopause, ovarian failure, or pituitary disorders. Lower-than-expected levels could indicate conditions like hypogonadism or pituitary tumors, though other factors (e.g., medications) may also affect results.
Does diet or exercise affect FSH levels?
While diet and exercise can influence overall hormone health, they don’t directly alter FSH levels. Stress, certain medications (e.g., birth control, antidepressants), and chronic illnesses may also impact 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