Quick Facts
- Sample: Blood
- Fasting: No special preparation is required
- Turnaround: 3-5 business days. May take longer based on weather, holiday, or lab delays.
What This Test Measures
This test measures IgE antibody levels specific to Brazil nut in a blood sample. Brazil nut is a tree nut, and the presence of IgE antibodies to it reflects sensitization to Brazil nut proteins. This test evaluates Brazil nut alone and does not measure IgE levels to any other tree nut, seed, or food. A positive result indicates sensitization to Brazil nut, not a confirmed clinical food allergy, and results should be reviewed alongside your symptoms and history with a qualified healthcare provider.
Benefits
- Measures IgE antibody response specific to Brazil nut
- Uses a simple blood draw with no special preparation
- Provides objective lab data to discuss with your provider
- Convenient online ordering with local lab visit
- Results delivered online for easy access
- May support a broader allergy evaluation guided by your provider
Who Is This Test For?
- People who have experienced symptoms after eating Brazil nuts or Brazil nut-containing products
- People whose healthcare provider has recommended checking for Brazil nut-specific IgE
- People wanting objective lab information to bring into a conversation with their provider
- People tracking Brazil nut sensitization as part of an ongoing care plan
- People who want to test for Brazil nut specifically, rather than tree nuts broadly
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What does this test measure, and how is it different from other food allergy tests?
This test isolates a single biomarker, IgE antibodies to Brazil nut, rather than testing multiple tree nuts or foods at once. Because tree nut allergies are specific to each nut, a result here reflects only your immune response to Brazil nut and does not indicate whether you are sensitized to other tree nuts, peanuts, or seeds.
2. Who should consider this test, and when?
Anyone who has noticed symptoms after eating Brazil nuts, or who has been advised by a healthcare provider to check specifically for Brazil nut sensitization, may find this test relevant. It can also be useful for people who want targeted information about Brazil nut rather than a broader panel.
3. Do I need to fast or prepare for this test?
No special preparation is required for this test. You can visit the lab for your blood draw without fasting or making other adjustments beforehand.
4. How quickly will I get results?
Results are typically available in 3-5 days, though timing may take longer based on weather, holidays, or lab delays. You'll be able to view your results online once they're ready.
5. How should I interpret my results, and what if they are abnormal?
Interpreting this result depends on the measured IgE level together with your symptoms, exposure history, and other clinical information, and it should be reviewed with a qualified healthcare provider rather than on its own. A positive result reflects sensitization to Brazil nut but does not by itself confirm a clinical allergy, predict how severe a reaction might be, or establish whether Brazil nut is safe to eat. If your result falls outside the expected range, your provider can help determine what additional evaluation, if any, may be appropriate; this test does not diagnose a food allergy or recommend a specific dietary or treatment plan.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
Pre-test preparation
No special preparation is required.
Cross-Reactivity
Cross-reactivity may occur when the immune system recognizes similar proteins across different foods, even though those foods are biologically distinct. This test measures only IgE antibodies to Brazil nut and does not test for the other allergens described below. The relationships below are not an exhaustive list, and they represent possible additional considerations rather than confirmed allergies. Having a Brazil nut allergy does not mean you will necessarily react to every allergen listed here; related allergen testing may be worth discussing with your healthcare provider depending on your history and symptoms.
- Other tree nuts (walnut, cashew, hazelnut, almond, pistachio, pecan): Brazil nut shares seed storage proteins with several other tree nuts, and clinical studies suggest that people allergic to one tree nut are more likely to also react to another, though the degree of cross-reactivity varies by nut pairing.
- Sunflower seeds, sesame seeds, and mustard seed: These foods contain 2S albumin storage proteins structurally similar to Ber e 1, the main Brazil nut allergen, which may contribute to cross-reactive sensitization in some individuals.
- Peanut: Some research has suggested a degree of shared sensitization between peanut and Brazil nut, though peanut is botanically a legume rather than a tree nut.
- Birch pollen (oral allergy syndrome): As with other tree nuts, some individuals with Brazil nut sensitivity report mouth or throat itching linked to pollen-food cross-reactivity, distinct from a classic food allergy reaction.
