Skip to content

FSH (Follicle-Stimulating Hormone) in Serum/Plasma

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

This test measures your levels of follicle-stimulating hormone, a key hormone involved in reproductive health, including egg and sperm production.

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
1478-7
Short code
FSH pre GnRH SerPl-mCnc
Synonyms
FSH pre GnRH 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 This Test Might Be Ordered

Your healthcare provider may recommend an FSH test to evaluate reproductive function, especially if you're experiencing symptoms like irregular periods, infertility, or signs of early menopause. It can also help diagnose conditions like polycystic ovary syndrome (PCOS) or hypogonadism in men and women.

What to Expect Before the Test

No special preparation is needed for this blood test. You may be asked to fast for 8–12 hours before the draw, but this depends on your provider’s instructions. Wear a comfortable shirt for easy access to your arm.

What Happens During the Test

A healthcare professional will insert a small needle into your arm to draw blood. The process usually takes just a few minutes. You may feel a slight pinch, but most people tolerate it well.

What the Results Mean

Results are interpreted based on your age, sex, and overall health. High or low FSH levels can signal different conditions, so your provider will discuss the findings with you in detail.

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

How often should I get this test?
The frequency depends on your symptoms, medical history, and provider’s recommendations. Some people get it once, while others may need follow-up tests every few months or years.
What are common causes of abnormal FSH levels?
Abnormal FSH levels can result from conditions like polycystic ovary syndrome (PCOS), premature ovarian insufficiency, thyroid disorders, or genetic factors. Stress, weight changes, or certain medications may also influence hormone levels.
Can lifestyle changes affect FSH levels?
Yes, lifestyle factors like diet, exercise, weight management, and stress reduction can impact hormone balance. Maintaining a healthy weight, managing stress, and avoiding smoking may help support normal FSH levels.
  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