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Follicle Stimulating Hormone (FSH) – Serum, Quantitative Measurement

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

This test measures the amount of follicle-stimulating hormone (FSH) in your blood. FSH plays a key role in regulating reproductive hormones in both men and women.

Quick summary

["FSH helps balance reproductive health and may indicate issues with ovulation, fertility, or hormone production."]

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

Key facts at a glance

LOINC
48570-6
Short code
FSH D10 SerPl-aCnc
Synonyms
FSH D10 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

Why This Test Is Done

Doctors may order an FSH test to evaluate fertility problems, assess hormone imbalances, diagnose conditions like polycystic ovary syndrome (PCOS), or check for early signs of menopause or hypogonadism (low hormone levels). It can also help monitor conditions like Klinefelter syndrome in men or testicular dysfunction.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the blood draw if your doctor specifies it. Wear comfortable clothing and plan to rest afterward, as you might feel lightheaded.

What Happens During the Test

A healthcare provider will insert a small needle into a vein in your arm to draw blood. You may feel a brief pinch, but the procedure takes only a few minutes. The blood sample is then sent to a lab for analysis.

What the Results Mean

Results are interpreted based on your age, sex, and medical history. High or low FSH levels can signal different health concerns, so your doctor will discuss findings with you in the context of your overall health.

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

What causes abnormal FSH levels?
Abnormal FSH levels can result from hormonal imbalances, genetic conditions, or medical treatments (e.g., chemotherapy). Conditions like PCOS, thyroid disorders, or kidney disease may also affect FSH. Always discuss symptoms with your doctor, as they may influence test results.
How often should I get this test?
Your doctor will determine how often you need an FSH test based on your health concerns. Some patients may need monitoring every few months, while others may only require it once. Follow-up depends on your treatment plan or symptoms.
Can lifestyle changes affect FSH levels?
Yes, lifestyle factors like diet, exercise, and stress can influence hormone levels. Maintaining a balanced diet, managing stress, and avoiding smoking may support healthy hormone function, but results are best interpreted with medical guidance.
  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