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Total IgE Antibody Level (Serum)

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

This test measures the amount of Immunoglobulin E (IgE) antibodies in your blood. IgE is linked to allergic reactions and certain immune responses.

Quick summary

["IgE levels help identify allergies or immune conditions."]

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

Key facts at a glance

LOINC
39603-6
Short code
Guinea Pig Epith IgE/IgE total %
Synonyms
Guinea Pig Epith 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 Mean in Allergy Testing

IgE antibodies are part of your immune system’s response to allergens like pollen, dust, or certain foods. High levels may suggest allergies, asthma, or other allergic conditions. Your doctor may order this test if you have symptoms like sneezing, itching, or skin reactions.

How the Test Works

A small blood sample is taken from your arm and sent to a lab. The lab uses an immunoassay (a sensitive test that detects specific antibodies) to measure your IgE antibody levels. Results are compared to a reference range to help determine if your levels are elevated.

Common Reasons for Testing

Doctors often recommend this test if you have symptoms of allergies, such as hay fever, eczema, or severe reactions like anaphylaxis. It may also be used to monitor conditions like chronic urticaria (hives) or certain immune disorders.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a slight bruise or pinch at the injection site, but it usually goes away quickly. If you’re on blood-thinning medication or have a bleeding disorder, let your doctor know before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgE Total

Frequently asked questions

Why might my IgE levels be checked?
IgE levels can indicate an allergic reaction or hypersensitivity to certain substances. High IgE is often linked to allergies, asthma, or conditions like atopic dermatitis. Low IgE may suggest a different immune issue, but this is less common. Your doctor will consider your symptoms and medical history when interpreting results.
What do my IgE test results mean?
Results alone don’t diagnose a condition—they’re part of a bigger picture. If your IgE levels are high, your doctor may recommend allergy testing (like skin prick tests or blood tests for specific allergens) to identify triggers. If levels are normal but you still have symptoms, other tests may be needed.
Can IgE levels change over time?
Yes, IgE levels can fluctuate based on exposure to allergens, immune responses, or underlying health conditions. For example, seasonal allergies may cause temporary spikes in IgE. If your levels change, your doctor may retest to monitor trends or adjust treatment plans.
  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