IgE Blood Test Results Explained: Normal Range & High Levels
Also known as: Immunoglobulin E, total IgE, IgE blood test, allergy blood test
IgE (immunoglobulin E) is an antibody your immune system makes in response to allergens and parasites. A total IgE blood test measures the overall amount, while specific IgE tests check reactions to individual allergens. A normal total IgE in adults is roughly under 100–150 IU/mL; a high IgE commonly reflects allergies, asthma, or eczema, and sometimes parasitic infection.
IgE normal range
| Category | Range (IU/mL) |
|---|---|
| Normal (adults) | < 100–150 IU/mLVaries by lab and age |
| Elevated | > 150 IU/mLOften allergic conditions |
| Markedly elevated | > 1,000 IU/mLInvestigate further |
Reference ranges vary by laboratory. Use the range printed on your own report as the definitive comparison.
What high IgE can mean
- Allergies (hay fever, food, environmental)
- Asthma
- Eczema (atopic dermatitis)
- Parasitic infections
- Rarely, certain immune disorders
What low IgE can mean
- Low IgE is usually not a concern
- Rarely associated with certain immune deficiencies
What to do about an abnormal result
- Total IgE indicates overall allergic tendency; specific IgE tests identify what you react to.
- A high total IgE is interpreted alongside your symptoms and history.
- Allergy management often combines test results with an allergist's evaluation.
Understand your own results
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Frequently asked questions
What does a high IgE level mean?
A high total IgE most often reflects an allergic tendency — hay fever, asthma, food allergies, or eczema. Very high levels can also occur with parasitic infections or, rarely, specific immune disorders. Specific IgE testing pinpoints which allergens you react to.
Can IgE tell me exactly what I'm allergic to?
Total IgE only shows your overall allergic activity. To identify specific triggers, doctors order allergen-specific IgE tests (or skin testing), which measure your response to individual substances like pollen, peanuts, or dust mites.
Related biomarkers
Medically reviewed by Antonieta Rueda, MD and Ayham Shneker, MD · Last reviewed July 6, 2026
This article is for informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or your lab results.