Quick Facts
- Sample: Blood
- Fasting: No special preparation required
- Turnaround: 3-5 business days. May take longer based on weather, holiday or lab delays.
What This Test Measures
This blood test measures the amount of allergen-specific IgE antibodies to macadamia nut (F345 IgE Macadamia Nut) in your blood sample. IgE antibodies are part of the immune response involved in allergic reactions.
The test looks only at macadamia nut and does not measure other tree nuts or foods. A result shows whether IgE antibodies to macadamia nut are present. It does not confirm a clinical food allergy on its own.
Benefits
- Measures IgE antibodies specific to macadamia nut
- Uses a simple blood sample with no special preparation
- Gives you results you can share with your healthcare provider
- Helps you take a documented step when macadamia nut reactions are a concern
- Provides results online after your lab visit
Who Is This Test For?
- Adults or children who have had symptoms after eating macadamia nuts
- People who want to measure macadamia nut IgE antibodies
- Individuals with a known tree nut allergy who want macadamia nut examined specifically
- Anyone who wants results to review with a healthcare provider
- People who want a lab-based option for macadamia nut IgE testing
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What does this test look at, and why might it be useful?
Macadamia nut is the only allergen included, and the measurement is allergen-specific IgE in your blood. Your healthcare provider may use the result alongside your symptoms and history when evaluating a possible macadamia nut allergy. The result alone does not confirm an allergy or show how severe a reaction might be.
2. Who should consider this test, and when?
If you have noticed symptoms after eating macadamia nuts, such as hives, itching around the mouth, stomach pain, or trouble breathing, this test may be worth considering. Macadamia nuts appear in many foods, including cookies, cereals, and chocolate candy, so unexpected exposure can prompt questions. Your healthcare provider can help decide whether testing fits your situation.
3. Do I need to fast or prepare for this test?
No special preparation is required. You can visit the lab without changing your routine.
4. How quickly will I get my results?
Expect results in 3-5 business days. Results may take longer based on weather, holiday or lab delays. You will receive them online.
5. How should I interpret my results, and what if they are abnormal?
Interpretation depends on your result, your symptoms, and your clinical history. A detectable macadamia nut IgE level shows that antibodies are present, but it does not by itself establish a clinical allergy. A low or undetectable result does not guarantee that you can eat macadamia nuts safely. If your results are abnormal, review them with a qualified healthcare provider, who can advise on next steps.
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 required.
Cross-Reactivity
Cross-reactivity may occur when the immune system recognizes similar proteins in different foods or substances. This test measures only macadamia nut IgE and does not test for any of the items below. These examples are not exhaustive, and they are possible considerations rather than confirmed allergies. Depending on your history, symptoms, or your healthcare provider's guidance, related allergen testing may be worth discussing.
- Other tree nuts: People with an allergy to one tree nut are often sensitized to others, though not everyone will react clinically to each one.
- Walnut and pecan: These nuts share closely related allergenic proteins, and some people allergic to one react to the other.
- Cashew and pistachio: These nuts are botanically related and have been associated with cross-reactivity in some people.
- Hazelnut: Some people with tree nut allergy are sensitized to hazelnut, and reactions may vary between individuals.
- Peanut: Peanut is a legume, but some people with tree nut allergy are also allergic to peanut, which may reflect co-allergy or shared proteins.
