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 the level of allergen-specific IgE antibodies your immune system has produced in response to green beans (Phaseolus vulgaris), also known as common bean, French bean, string bean, snap bean, wax bean, or haricot bean. Using a blood sample, the test looks for IgE antibodies directed against green bean proteins, including the key allergen Pha v 3, a lipid transfer protein (LTP). This is a single food allergen IgE test and does not evaluate other foods, allergens, or antibody classes.
Benefits
- Measures IgE antibody response specifically to green beans
- Uses a standard blood draw, no special equipment needed
- Provides objective lab data to discuss with your provider
- Requires no special preparation or fasting
- Focused, single allergen result for green bean sensitization
- Results delivered online for easy access
Who Is This Test For?
- People who have experienced symptoms after eating, handling, or cooking green beans
- Individuals working with a healthcare provider to investigate a suspected green bean allergy
- People with a family history of legume allergies who want objective data on green beans specifically
- Individuals who react to green bean steam or particles during cooking and want to explore green bean sensitization
- People whose provider has recommended IgE testing as part of a broader allergy 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 allergen-specific IgE antibodies to green beans in a blood sample, focusing on your immune response to green bean proteins such as Pha v 3. Unlike skin prick testing or oral food challenges, it relies on a blood draw and reports antibody levels rather than an in-person reaction. It measures only green beans, not other legumes, foods, or antibody classes such as IgG.
2. Who should consider this test, and when?
People who suspect a green bean allergy, whether from ingestion, handling, or exposure to cooking steam, may find this test relevant. It can also be useful when a healthcare provider is evaluating symptoms that appear connected to green bean consumption or contact. This test looks only at green beans and does not assess other legumes or foods you may also be concerned about.
3. Do I need to fast or prepare for this test?
No special preparation is required for this test. You can schedule your blood draw without adjusting your diet, medication, or daily routine beforehand.
4. How quickly will I get results?
Results are typically available in 3-5 days, though this may take longer due to weather, holidays, or other lab delays. You can access your results online once they are ready.
5. How should I interpret my results, and what should I do if they are abnormal?
Interpreting your result depends on the antibody level detected, your personal and family history, any symptoms you have experienced, and other clinical information your provider may consider. A detected IgE response indicates sensitization to green beans, but it does not by itself confirm a clinical allergy, predict reaction severity, or establish whether green beans are safe or unsafe for you to eat. If your results fall outside the expected range, review them with a qualified healthcare provider, who can help determine whether further evaluation is appropriate. This test does not diagnose a food allergy or recommend treatment on its own.
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 can occur when your immune system recognizes proteins in one substance that closely resemble proteins in another, sometimes triggering a reaction to both. This test measures IgE antibodies to green beans only, and it does not test for any of the additional foods, pollens, or substances described below. The examples that follow are not exhaustive, and they represent possible relationships rather than confirmed allergies. They do not mean you will necessarily react to any of the items listed, and this test result does not predict whether such a reaction would occur.
The main green bean allergen, Pha v 3, belongs to a group of proteins called lipid transfer proteins (LTPs), which are recognized allergens across a range of plant-based foods and are associated with what is sometimes called LTP syndrome.
- Peach and other Rosaceae fruits (such as apple, cherry, apricot): These fruits contain related LTPs, and cross-reactivity with peach LTP (Pru p 3) has been documented in LTP-sensitized individuals.
- Peanuts and other legumes (such as lentils, soybeans, chickpeas): Some legumes contain their own LTP allergens that may share structural similarities with green bean LTP.
- Tree nuts: Certain tree nuts contain LTPs that have been associated with cross-reactivity in people sensitized to plant LTPs.
- Cereal grains (such as wheat): LTPs found in some cereals have been linked to cross-reactive responses in LTP-sensitized individuals.
- Certain pollens (such as mugwort or plane tree): Pollen exposure has been associated with LTP-related sensitization in some individuals, particularly in regions where LTP syndrome is more prevalent.
These relationships may help identify other allergens that could be relevant to discuss with your healthcare provider, particularly if you have a history of reactions to multiple plant-based foods. Depending on your symptoms and history, related allergen testing may also be worth considering as part of a broader evaluation, based on your provider's guidance.
