Test library
Hazelnut IgE Test
A blood test that measures IgE antibodies to hazelnut, also called filbert, to help identify a tree nut allergy after reactions to the nut or foods containing it.
Order Hazelnut (Filbert) Allergy Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Hazelnut (Filbert) Allergy Test- Typical turnaround
- 1-3 business days
- Starting price
- From $49
- Results
- Confidential, online
Quick answer
This test checks a blood sample for IgE antibodies that bind to hazelnut proteins. It is used when symptoms such as mouth itching, hives, or digestive upset follow eating hazelnuts, filberts, or products that contain them. A healthcare provider interprets the result with the reaction history.
What this test measures
Hazelnut, also known as filbert or cobnut, is a tree nut that can trigger IgE-mediated reactions. Several distinct proteins in the nut, including PR-10, lipid transfer protein, and seed storage proteins, may be involved. The test measures specific IgE antibodies produced against hazelnut proteins.
The sample is collected through a routine blood draw and analyzed in a laboratory. Results typically include hazelnut-specific IgE, total IgE, and a semiquantitative class. Component testing may report individual proteins such as Cor a 1, Cor a 8, Cor a 9, and Cor a 14, which can help a clinician assess reaction patterns.
People order this test after a suspected reaction to hazelnuts or when a broader tree nut evaluation is underway. Because hazelnut proteins also resemble some pollen proteins, a positive result can sometimes reflect cross-reactivity rather than a primary food allergy, which is why clinical context matters.
- Hazelnut-specific IgE antibody
- Total serum IgE
- IgE reactivity class for hazelnut
- PR-10 component (Cor a 1) IgE
- Lipid transfer protein (Cor a 8) IgE
- Seed storage protein (Cor a 9) IgE
- 2S albumin (Cor a 14) IgE
- Birch pollen cross-reactive IgE
Why people order this test
- Evaluate itching, hives, or digestive symptoms after hazelnut
- Distinguish true nut allergy from pollen cross-reactivity
- Assess risk when other tree nuts are also eaten
- Support nut avoidance planning with a clinician
- Add component markers to a broader tree nut panel
How to prepare
No fasting is required, and the test can be collected at any time of day. A blood sample is drawn at a laboratory. Follow the collection instructions supplied by the laboratory.
Understanding your results
Reports usually arrive within one to three business days. A detectable IgE level indicates sensitization to hazelnut, and the clinical meaning depends on symptoms and exposure as assessed by a healthcare provider.
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Frequently Asked Questions
Is filbert another name for hazelnut?
Yes. Filbert and cobnut are common names for the same nut, so testing covers the same allergen source.
Does a positive result mean I react to all tree nuts?
No. Nut allergies are often specific, though cross-reactivity with related nuts can occur.
Why do component tests matter?
They identify specific proteins, which can help a clinician distinguish pollen-related cross-reactivity from a likely food allergy.
Can hazelnut allergy be outgrown?
Some children outgrow tree nut allergies, but this should be evaluated by a healthcare provider rather than assumed.
Do I need to eat hazelnuts before the test?
No. The test measures circulating antibodies and does not require recent exposure.
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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Every page on this site is reviewed for clarity, sourcing, and accuracy. We update our library as testing options, collection networks, and accreditation standards change.