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Follicle Stimulating Hormone (FSH) - Serum, Prepared for Analysis by Electrophoresis

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

This test measures the level of follicle-stimulating hormone (FSH) in your blood, a hormone important for reproductive health in both men and women.

Quick summary

["FSH helps regulate egg development in women and sperm production in men."]

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

Key facts at a glance

LOINC
65350-1
Short code
FSH pre/p chal SerPl-aCnc
Synonyms
FSH pre/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 Follicle-Stimulating Hormone (FSH)?

Follicle-stimulating hormone (FSH) is a key hormone in the reproductive system. In women, it plays a role in the development of eggs in the ovaries. In men, it supports sperm production in the testicles. FSH levels can vary depending on your age, menstrual cycle (in women), and overall health.

Why Might You Need This Test?

Your doctor may order an FSH test to check for reproductive health issues, such as infertility, irregular menstrual cycles, low testosterone, or conditions affecting hormone balance. It can also help diagnose hormonal imbalances or evaluate fertility treatments.

Sample Collection and Preparation

A blood sample is drawn from a vein, usually in your arm. The blood is then processed to separate the serum, which is prepared specifically for this test. This process ensures accurate measurement of FSH levels.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to avoid certain medications or supplements that could affect results. If you are pregnant or breastfeeding, inform your doctor before the test.

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 of FSH Levels

Short name

FSH (Serum)

Frequently asked questions

How long will it take to get my results?
Results are typically available within 1 to 3 business days, depending on your lab. Your doctor will discuss the findings with you during your follow-up visit.
What do my FSH results mean?
FSH levels can indicate whether your reproductive system is functioning normally. Very high or very low levels may suggest conditions like early menopause, polycystic ovary syndrome (PCOS), or hypogonadism. Your doctor will interpret results in the context of your medical history and symptoms.
Can lifestyle changes affect FSH levels?
Yes, factors like stress, poor sleep, obesity, and certain medications can influence hormone levels, including FSH. Maintaining a healthy lifestyle and discussing any 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