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Total IgE (Immunoglobulin E) Antibody Level

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

This test measures the amount of Immunoglobulin E (IgE) in your blood. IgE is a type of antibody that plays a role in allergic reactions and responses to certain substances.

Quick summary

["IgE levels help identify allergies or immune system sensitivities."]

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

Key facts at a glance

LOINC
61291-1
Short code
Rice IgE/IgE total %
Synonyms
Rice IgE/IgE total %
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 IgE Levels Tell Us About Your Health

IgE antibodies are part of your immune system’s defense against allergens like pollen, dust mites, or certain foods. High levels may suggest allergies, asthma, or other allergic conditions. Very low levels might indicate a weakened immune response to allergens, though this is less common.

How the Test Works

Your blood sample is tested using an immunoassay method to detect and quantify IgE antibodies. This process identifies the concentration of IgE in your serum or plasma.

Why You Might Need This Test

Doctors may order this test if you have symptoms of allergies (e.g., itching, sneezing, skin reactions), if you’ve been exposed to potential allergens, or if you have conditions like asthma or eczema that may involve IgE involvement.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw blood. The process is quick and usually painless. If you’re on blood-thinning medication, let your doctor know before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Understanding IgE Levels

Short name

IgE Total

Frequently asked questions

What does a high IgE level mean?
High IgE levels often indicate an allergic reaction or hypersensitivity to certain substances. This can help doctors diagnose allergies, asthma, or other allergic disorders. However, elevated IgE alone doesn’t confirm an allergy—other tests (like skin prick tests or allergy challenges) may be needed for a full diagnosis.
What does a low IgE level mean?
Low IgE levels are less common and may suggest a reduced immune response to allergens. In some cases, they could be associated with conditions like atopic dermatitis (eczema) in children or certain immune deficiencies, but further evaluation is needed to determine the cause.
Can IgE levels change over time?
Yes, IgE levels can fluctuate depending on exposure to allergens, immune responses, or underlying health conditions. For example, symptoms like seasonal allergies may cause temporary spikes in IgE. Regular monitoring may be needed if you have ongoing allergic conditions.
  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