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's Included
This test measures allergen-specific IgE antibodies to lima bean (F182-IgE Lima Bean) in a blood sample. IgE antibodies are produced by the immune system in response to substances it identifies as harmful, and elevated levels to a specific allergen can indicate sensitization to that allergen.
This is a single allergen test. It evaluates your IgE response to lima beans specifically and does not test for other beans, legumes, or foods. The result reflects only your immune system's IgE reaction to lima bean protein, not a clinical diagnosis of food allergy on its own.
Benefits
- Measures IgE sensitization to lima bean specifically
- Uses a standard blood draw, no special preparation needed
- Results available in 3-5 business days in most cases
- Provides objective data to discuss with a healthcare provider
- Focused, single allergen result for lima bean
Who Is This Test For?
- Individuals who have experienced symptoms after eating lima beans or related dishes
- People who have noticed reactions after consuming succotash, soups, stews, or casseroles containing lima beans
- Those working with a healthcare provider to investigate a possible lima bean sensitivity
- People who want IgE-specific information about lima beans prior to a medical consultation
- Individuals who prefer a standard blood draw over other testing methods
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 quantifies IgE antibodies specific to lima bean (F182) from a blood sample. It's a single allergen test, so it does not include other beans, legumes, or foods, and it does not evaluate IgG or other antibody classes. Because it targets one specific allergen, it's more narrowly scoped than tests that screen multiple foods at once.
2. Who should consider this test, and when?
Symptoms such as digestive upset, hives, itching around the mouth, swelling, or respiratory symptoms occurring after eating lima beans or dishes containing them (like succotash or certain soups and stews) are common reasons people look into this test. It may be a useful starting point when a lima bean connection to symptoms is suspected, and you want IgE-specific information to bring to a healthcare provider.
3. Do I need to fast or prepare for this test?
No special preparation is required for this blood test. You can have the sample drawn at a local lab without fasting or any advance steps.
4. How long will it take to get my results?
Results are typically available in 3-5 business days, though this may take longer depending on weather, holidays, or other lab delays.
5. How should I interpret my results, and what if they are abnormal?
An elevated IgE level to lima bean indicates sensitization, meaning your immune system has produced antibodies to lima bean protein, but sensitization alone does not confirm a clinical food allergy or predict how severe a reaction might be. Interpretation depends on your result together with your symptoms, history, and other relevant clinical information, so if your result is abnormal, review it with a qualified healthcare provider who can help determine appropriate next steps. A positive result does not automatically mean lima beans must be eliminated from your diet, and a negative result does not guarantee that consuming lima beans is safe.
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 happens when the immune system recognizes proteins in one allergen that closely resemble proteins in another, sometimes leading to IgE binding across substances that aren't the same food. This lima bean test measures only IgE specific to lima beans, and it does not test for any of the other foods, legumes, or pollens described below. The relationships noted here are drawn from published research and are not an exhaustive list. They represent possible additional considerations rather than confirmed allergies, and having IgE reactivity to lima beans does not mean you will necessarily react to any of the items listed. Depending on your symptoms, history, or prior reactions, discussing related allergen testing with your healthcare provider may be worth considering.
Research on legume allergy has found that laboratory (in vitro) cross-reactivity among legumes is common, but clinical reactions to more than one legume are much less frequent, meaning a shared IgE response doesn't reliably predict an actual reaction to another legume. Documented and studied relationships for lima bean include:
- Peanut: Peanut is a legume that has been studied alongside lima beans for shared IgE-binding proteins, though clinical reactions to both are uncommon in the same individual.
- Soybean: Soybean has been examined together with lima bean in legume cross-reactivity research, with laboratory cross-reactivity reported more often than clinical reactivity.
- Garbanzo bean (chickpea): Garbanzo bean has shown shared IgE-binding patterns with lima bean in legume family studies, without necessarily indicating a clinical allergy to both.
- Pea: Pea has been included in legume panels alongside lima bean, showing similar in vitro cross-reactivity findings.
- Green bean: Some studies list green bean among legumes tested for cross-reactivity with lima bean, though it has also been noted as relatively well tolerated by some legume-allergic individuals.
- Mesquite tree pollen: A study of patients with asthma or rhinitis found that lima bean extract could inhibit IgE binding to mesquite pollen in some individuals, suggesting shared allergenic proteins between the two.
Because clinically meaningful cross-reactivity between legumes has been found to be relatively rare despite shared laboratory findings, a positive lima bean result should not be used on its own to justify avoiding other legumes. If reactions to other legumes or pollen are a concern, further evaluation may be considered based on your history and your healthcare provider's guidance.
