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Follicle Stimulating Hormone (FSH) - Serum

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, influencing both male and female hormone production.

Quick summary

["FSH helps regulate fertility and hormone balance in both genders."]

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

Key facts at a glance

LOINC
70041-9
Short code
FSHB c.-211G>T Bld/T Ql
Synonyms
FSHB c.-211G>T Bld/T Ql
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
3.5
Ref high
12.5
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
CPT
83001
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order an FSH test to evaluate fertility issues, assess hormone imbalances, diagnose conditions like polycystic ovary syndrome (PCOS) in women, or check for pituitary gland problems. It can also help monitor hormone therapy or identify signs of aging in reproductive organs.

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 if your doctor specifies it, but this is not always required for FSH. Bring any medications you’re currently taking to your appointment.

How the Test Is Performed

A healthcare provider will insert a needle into a vein, usually in your arm, to collect a blood sample. The process is quick and typically causes only minor discomfort. You may feel a slight pinch or sting, but the area will heal quickly.

Possible Results and Their Meaning

Results are interpreted based on your age, sex, and medical history. Higher or lower-than-expected FSH levels may signal potential issues with hormone production, reproductive health, or other endocrine conditions. Your doctor will discuss these findings with you in detail.

Reference range

Follicular: 3.5-12.5 mIU/mLN/A

Specimen: whole-blood

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

Short name

FSH Level

Frequently asked questions

What might cause abnormal FSH levels?
FSH levels can be affected by conditions such as premature ovarian insufficiency (POI) in women, hypogonadism in men, pituitary tumors, or genetic disorders. Chronic kidney disease, thyroid disorders, or certain medications can also influence FSH. Always consult your doctor for personalized interpretation.
How often should I get this test?
The frequency depends on your medical needs. Your doctor may recommend periodic testing if you have fertility concerns, hormone-related symptoms, or ongoing reproductive health monitoring. Follow-up tests are often scheduled based on your treatment plan or symptoms.
Can lifestyle changes affect FSH levels?
Yes, lifestyle factors like diet, exercise, stress, and smoking can influence hormone levels. Maintaining a balanced diet, managing stress, and avoiding smoking may support overall hormonal health, but results may vary among individuals. Discuss these factors with your healthcare provider if you’re concerned.
  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