Quick Facts
- Sample: Blood
- Fasting: No special preparation required
- Turnaround: 2-5 business days (may take longer based on weather, holiday, or lab delays)
What's Included
This test measures allergen-specific IgE antibodies to pecan (F201) in a blood sample. When your immune system identifies pecan proteins as a threat, it can produce IgE antibodies against them, and this test detects and measures the presence of those antibodies. The result reflects IgE sensitization to pecans specifically, not to other tree nuts or foods, and not a confirmed clinical allergy on its own.
Benefits
- Measures pecan-specific IgE with a single blood draw.
- Requires no special preparation beforehand.
- Provides objective, lab-based antibody data for your provider.
- Delivers results conveniently online.
- Supports a focused conversation about pecan sensitization with your provider.
Who Is This Test For?
- People who have experienced symptoms after eating pecans or pecan-containing foods.
- Individuals whose healthcare provider wants to evaluate possible pecan sensitization.
- People trying to identify a possible trigger behind unexplained reactions involving pecans.
- Individuals who want lab-based information to bring to a provider visit.
- People who prefer a blood test over in-office skin prick testing for this evaluation.
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 measures pecan-specific IgE antibodies in a blood sample, distinct from tests that evaluate other tree nuts, other foods, or other antibody classes such as IgG. Because it targets only pecan, it does not provide information about sensitization to walnuts, other tree nuts, or unrelated foods. Other food allergy tests may look at different allergens, different antibody classes, or allergen components rather than the whole allergen measured here.
2. Who should consider this test, and when?
Anyone who has noticed symptoms after eating pecans, or who wants to explore pecans as a possible trigger for a reaction, may find this test relevant to discuss with a healthcare provider. It can also be useful when a provider is narrowing down potential causes of a reaction involving pecan exposure. This test does not replace a full clinical evaluation and works best alongside your symptom history and provider guidance.
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 adjusting your diet or medications beforehand.
4. How quickly will I get results?
Results are typically available in 2-5 business days after your sample is processed. Turnaround may take longer during periods of severe weather, around holidays, or due to occasional lab delays.
5. How should I interpret my results, and what if they are abnormal?
Your result reflects the level of pecan-specific IgE detected in your blood sample, but interpretation depends on your symptom history, clinical background, and other factors a healthcare provider will consider together with this result. A detectable level of IgE indicates sensitization and does not by itself confirm a clinical food allergy, predict how severe a reaction might be, or establish whether pecans are safe or unsafe for you to eat. If your result falls outside the expected range, review it with a qualified healthcare provider, who can help place it in the context of your overall health and determine whether further evaluation is appropriate.
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 can occur when the immune system recognizes similar proteins across different foods or substances, sometimes triggering a response to more than one allergen. This test measures only pecan-specific IgE and does not test for any of the additional items discussed below. The examples here are not exhaustive, and they represent possible additional considerations rather than confirmed allergies. Having IgE sensitization to pecan does not mean you will necessarily react to any of the substances listed. Depending on your history, symptoms, or your healthcare provider's guidance, evaluating related allergens may also be something worth discussing.
- Walnut:Pecan and walnut share closely related allergenic proteins, and research has found a high degree of clinical cross-reactivity between the two, with many pecan-allergic individuals also reacting to walnut.
- Other tree nuts (such as cashew and pistachio): Cross-reactivity among various tree nuts has been documented, though the extent varies by nut pairing and is not uniform across all tree nuts.
- Birch pollen and related plant foods: Some tree nut proteins share structural similarities with birch pollen and certain fruits or vegetables, which has been associated with oral allergy syndrome (also called pollen food allergy syndrome) in some individuals.
Because cross-reactivity patterns can vary from person to person, a healthcare provider can help determine whether evaluating related allergens makes sense based on your specific history and symptoms.
