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Serum or plasma mass concentration of immunoglobulin E (IgE) antibodies

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

This test measures the amount of Immunoglobulin E (IgE), a type of antibody linked to allergic reactions and certain immune responses.

Quick summary

["IgE levels help diagnose allergies, asthma, or other immune-related conditions."]

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

Key facts at a glance

LOINC
6182-0
Short code
M racemosus IgE Qn
Synonyms
M racemosus IgE Qn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Immunoglobulin E (IgE)?

IgE is a protein produced by your immune system in response to allergens (like pollen, pet dander, or certain foods). High levels may indicate allergies, asthma, or conditions like hay fever or eczema. Your body may also produce IgE in response to infections or other immune reactions.

Why Might You Need This Test?

Doctors may order an IgE test to diagnose allergies, evaluate symptoms like sneezing, itching, or wheezing, or check for conditions like chronic urticaria (hives) or certain parasitic infections. It can also help monitor treatment effectiveness.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The sample is sent to a lab, where it is analyzed to measure IgE levels. The test typically takes a few hours to complete.

What Do Results Mean?

Results are compared to standard reference ranges, but they can vary by lab. High IgE levels may suggest allergies, asthma, or other immune disorders, while normal or low levels may indicate no active allergic reaction or infection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgE Level

Frequently asked questions

Why might my doctor recommend this test?
Your doctor may recommend this test if you have symptoms like persistent sneezing, itching, skin rashes, or breathing difficulties. It can also help diagnose conditions like allergic rhinitis, asthma, or certain parasitic infections.
What happens if my IgE levels are high?
High IgE levels often point to allergies or immune-related conditions. Your doctor may suggest allergy testing, treatment plans (like avoiding triggers or medications), or further evaluation if symptoms persist.
Can IgE levels change over time?
Yes, IgE levels can fluctuate based on allergens, infections, or treatments. Regular monitoring may be needed if you have ongoing symptoms or conditions like asthma or eczema.
  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