Test library
Walnut Sensitivity Test
The Walnut allergy test measures IgE antibodies against walnut proteins in a blood sample. It helps identify tree nut sensitization in people who have allergic reactions after eating walnuts or foods that contain them.
Order Walnut 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 Walnut Allergy Test- Typical turnaround
- 1-3 business days
- Starting price
- From $49
- Results
- Confidential, online
Quick answer
The Walnut allergy test is a blood test that measures immunoglobulin E antibodies against walnut proteins. Tree nut allergies can cause reactions that range from mild oral itching to more serious symptoms, so identifying sensitization helps guide avoidance and care. The test is often ordered with other nut and food allergen tests. A qualified healthcare provider interprets the result with your history and symptoms.
What this test measures
Walnuts are tree nuts that contain several proteins capable of triggering an allergic response. The immune system of a sensitized person produces IgE antibodies that recognize these proteins, and a later exposure can release histamine and other mediators. Symptoms may include itching, hives, swelling, stomach upset, or breathing difficulty, depending on the person and the amount eaten.
The test measures walnut-specific IgE in serum using a laboratory immunoassay. Only a blood sample is needed, and the report provides a quantitative level or reactivity class. Results can be affected by cross-reactivity with other tree nuts and with some pollens, so clinicians often review the walnut result alongside related food allergen tests.
A positive test shows sensitization but does not by itself predict how severe a reaction would be. Some people have antibodies without symptoms, while others react to very small amounts. Anyone with a suspected food allergy should discuss results, avoidance, and an emergency plan with a qualified healthcare provider.
- Walnut-specific IgE antibodies
- Total serum IgE
- Quantitative allergen-specific IgE level
- IgE reactivity class for walnut
- Walnut storage proteins (Jug r 1, Jug r 2)
- Cross-reactive tree nut allergens
- Cross-reactive birch pollen allergens
Why people order this test
- Investigate reactions after eating walnuts
- Identify tree nut sensitization in a food allergy workup
- Review symptoms such as hives, swelling, or stomach upset
- Check cross-reactivity with other tree nuts
- Follow up on a previously positive food allergy result
How to prepare
No fasting is required for this blood test. A blood sample is collected from a vein, usually at the arm. Follow any specific instructions from the laboratory or ordering provider.
Understanding your results
Results are generally available within one to three business days. The report shows the walnut-specific IgE level and reactivity class. A qualified healthcare provider interprets the result with your symptoms, since a positive test does not measure reaction severity.
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Frequently Asked Questions
What does the walnut allergy test measure?
It measures IgE antibodies that react to walnut proteins. These antibodies indicate that the immune system is sensitized to walnuts.
Do I need to eat walnuts before the test?
No. The test looks for antibodies that are already present in the blood, so a recent exposure is not required.
Can this test predict how severe a reaction will be?
No. The level of antibodies does not reliably predict reaction severity. An allergist or healthcare provider evaluates the result with your history.
Will it detect other nut allergies?
It is specific to walnut, though cross-reactivity with other tree nuts can occur. A broader panel may be ordered when several nuts are a concern.
How soon are results ready?
Results are typically available within one to three business days after the sample reaches the laboratory.
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.