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FSH (Follicle Stimulating Hormone) with Serum/Plasma Measurement

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

This test measures your levels of follicle-stimulating hormone (FSH), a hormone produced by the pituitary gland that plays a key role in reproductive health.

Quick summary

["FSH helps regulate egg and sperm production and can indicate reproductive function or potential fertility issues."]

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

Key facts at a glance

LOINC
27887-9
Short code
FSH 15M p chal SerPl-aCnc
Synonyms
FSH 15M 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

Why This Test Is Done

Doctors may order an FSH test to evaluate reproductive health, diagnose conditions affecting fertility, or check for hormonal imbalances. It can also help assess conditions like polycystic ovary syndrome (PCOS), menopause, or testicular dysfunction.

Sample Collection and Preparation

A blood sample is taken from a vein in your arm. The sample is processed to separate serum or plasma, which is then analyzed for FSH levels. This process typically takes a few minutes, and you may feel a slight pinch during the draw.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if instructed by your healthcare provider. Wear comfortable clothing and avoid heavy exercise on the day of the test.

Common Conditions Monitored

FSH levels are often checked in cases of infertility, irregular menstrual cycles, low libido, or symptoms of hormonal imbalances. It may also be used to monitor conditions like ovarian or testicular disorders.

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 Does an Abnormal FSH Level Mean?
High FSH levels may suggest early menopause, ovarian failure, or conditions like PCOS. Low FSH levels could indicate pituitary gland issues, hypothyroidism, or certain genetic disorders affecting hormone production.
How Often Should I Get This Test?
Your doctor will determine the frequency based on your symptoms, medical history, and treatment needs. Follow-up tests may be scheduled if initial results are outside expected ranges or if symptoms persist.
Can Diet or Lifestyle Affect FSH Levels?
While diet and lifestyle factors like stress, weight, and smoking can influence hormone balance, they do not directly alter FSH levels. Maintaining a healthy weight and reducing stress may support overall reproductive health, though FSH testing remains a clinical assessment.
  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