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Total IgE (Immunoglobulin E) 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 parasites.

Quick summary

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

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

Key facts at a glance

LOINC
61318-2
Short code
Dandelion IgE/IgE total %
Synonyms
Dandelion 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

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like sneezing, itching, hives, or asthma, which could suggest an allergy. It may also be used to diagnose conditions like hay fever, food allergies, or certain parasitic infections.

What Does the Test Involve?

A small blood sample is taken from a vein in your arm. The blood is then sent to a lab where it is analyzed to measure the total IgE levels.

What Do My Results Mean?

Higher than normal IgE levels may indicate allergies or allergic conditions. Very high levels could suggest severe allergies or certain immune disorders. Lower levels might be seen in people with no allergies or in certain immune system conditions. Your healthcare provider will interpret the results in the context of your symptoms and medical history.

What Are Common Causes of Abnormal Results?

Elevated IgE levels can be linked to allergies (e.g., to pollen, dust, or foods), asthma, eczema, or parasitic infections. Very low IgE levels might be associated with certain immune deficiencies or lack of allergic reactions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Total Immunoglobulin E

Frequently asked questions

What Factors Could Affect My Results?
Several factors can influence IgE levels, including recent exposure to allergens, certain medications (like antihistamines), chronic illnesses, or underlying immune conditions. It’s important to inform your healthcare provider about any medications or conditions that might affect the test results.
How Soon Will I Get My Results?
Results from this test are typically available within a few days to a couple of weeks, depending on the lab’s processing time. Your healthcare provider will discuss the results with you during your follow-up visit.
Can I Take Anything Special Before the Test?
No special preparations are usually needed for this blood test. However, if you are on certain medications that affect your immune system or allergies, let your healthcare provider know before the test.
  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