Test library
IgE Level Test
The IgE Test measures total immunoglobulin E in a blood sample. Total IgE can be elevated in allergic disease and some other conditions, so it is used as a general screen rather than a test for one specific allergen.
Order IgE Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order IgE Test- Typical turnaround
- 1-3 business days
- Starting price
- From $49
- Results
- Confidential, online
Quick answer
The IgE Test is a blood test that measures the total amount of immunoglobulin E in the bloodstream. IgE is the antibody class involved in immediate allergic reactions, and total IgE may rise in conditions such as allergic rhinitis, asthma, eczema, and some parasitic infections. A normal or elevated total IgE does not identify which substance a person reacts to, so the test is usually combined with specific allergen testing when allergy is suspected.
What this test measures
Immunoglobulins are antibodies produced by the immune system, and IgE is the class associated with allergy. When a person is sensitized to a substance such as pollen, food, or animal dander, allergen-specific IgE can be produced. Total IgE measures all IgE in the blood together, without showing what it is directed against.
The test requires a blood sample, and the result is reported as a concentration, often in kilounits per liter or international units per milliliter. Reference ranges vary with age, and some laboratories provide an age-adjusted comparison. Because total IgE reflects many possible influences, it is usually ordered with a symptom history and, when appropriate, a specific allergen panel.
A high total IgE supports the possibility of an allergic tendency or a condition such as a parasitic infection, but it is not a diagnosis by itself. A normal total IgE does not rule out allergy, since local reactions and specific sensitization can occur with normal total levels. A qualified healthcare provider should interpret the result with the full clinical picture.
- Total serum immunoglobulin E (IgE)
- Total IgE concentration in kU/L or IU/mL
- Age-adjusted reference range comparison
- Allergen-specific IgE markers when a panel is ordered with it
- Blood eosinophil count when included
- Parasite-related antibody markers when ordered alongside
Why people order this test
- Screen for an allergic tendency when symptoms suggest atopy
- Support evaluation of asthma, eczema, or persistent nasal symptoms
- Provide context when specific allergen testing is planned
- Investigate suspected parasitic infection alongside other tests
- Assess immune function when immunoglobulins are being reviewed
- Follow conditions that are associated with elevated IgE over time
How to prepare
No fasting is required for this blood test. Follow the collection instructions provided by the laboratory, and tell the testing provider about any medications you take, since some can affect IgE levels.
Understanding your results
Results are typically available within one to three business days. An elevated total IgE may point toward an allergic or parasitic condition, while a normal result does not exclude allergy. A qualified healthcare provider can explain what the value suggests in the context of the person's symptoms.
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Frequently Asked Questions
Can my total IgE be normal even if I have allergies?
Yes. Total IgE can be normal in people with allergic symptoms, especially when only a few allergens are involved. Specific IgE testing is used to look for particular triggers.
What can raise total IgE?
Allergic conditions, eczema, asthma, some parasitic infections, and certain immune disorders can raise total IgE. The result is interpreted with other findings.
What is the difference between total IgE and specific IgE?
Total IgE measures all IgE in the blood, while specific IgE measures antibody directed at one allergen. Specific testing identifies triggers, while total testing gives a general picture.
Do I need to fast for an IgE test?
No fasting is required. This is a standard blood draw.
Does a high IgE mean I am allergic to something?
Not necessarily. A high value supports the possibility of allergy or another condition, but it does not identify a trigger or confirm a diagnosis on its own.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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