Red Kidney Bean (F287) IgE Biomarker Testing
It measures IgE antibodies to red kidney bean to help assess allergy risk; order through Vitals Vault with convenient labs and Quest results.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
Red Kidney Bean (F287) IgE is a blood test that looks for allergy-type antibodies (immunoglobulin E, IgE) that react to proteins found in red kidney beans.
A positive result can support an IgE-mediated food allergy picture, but it does not automatically mean you will react when you eat beans. Your symptoms, timing, and exposure history still matter.
This test is most useful when you are trying to explain immediate reactions after eating beans or mixed foods, or when you need to clarify whether legumes might be a trigger in a broader allergy workup.
Do I need a Red Kidney Bean F287 IgE test?
You may consider this test if you develop symptoms soon after eating red kidney beans or foods that commonly contain them (for example, chili, soups, burritos, or mixed salads). IgE-mediated reactions typically happen within minutes to a couple of hours and can include hives, itching, lip or throat swelling, wheezing, vomiting, or lightheadedness.
Testing can also be helpful if you have a history of food allergy and you are trying to sort out which ingredient caused a reaction in a multi-ingredient meal. Because beans are often eaten alongside other common allergens, a targeted blood test can help narrow the list of suspects.
You might also use this test when you are avoiding legumes due to uncertainty and want a more structured plan for what to reintroduce and what to keep avoiding. In that situation, results are best interpreted alongside your clinical history and, when appropriate, supervised food challenges.
This test supports clinician-directed care and shared decision-making, but it cannot diagnose an allergy by itself.
This is a laboratory-developed specific IgE blood test typically performed in a CLIA-certified lab; results must be interpreted with your symptoms and are not a standalone diagnosis.
Lab testing
Order Red Kidney Bean (F287) IgE testing and get results you can track over time.
Schedule online, results typically within about a week
Clear reporting and optional clinician context
HSA/FSA eligible where applicable
Get this test with Vitals Vault
Vitals Vault lets you order Red Kidney Bean (F287) IgE testing without needing to coordinate the logistics yourself. You choose a nearby lab location, complete a simple blood draw, and then review your results in one place.
If your result is confusing or does not match how you feel, PocketMD can help you make sense of common patterns, like why a low-positive IgE may not equal a true clinical allergy, or why cross-reactivity can create unexpected positives.
You can also use your results to plan next steps, such as adding related food IgE tests, checking for cross-reactive carbohydrate determinants (CCD), or deciding when a re-test makes sense after an elimination period or a change in allergy treatment.
- Order online and test at a local lab location
- Clear, plain-language result context with PocketMD
- Easy re-testing to track changes over time
Key benefits of Red Kidney Bean (F287) IgE testing
- Helps evaluate whether red kidney bean is a plausible trigger for rapid-onset allergy symptoms.
- Supports safer food planning when you are unsure whether to avoid beans or reintroduce them.
- Adds objective data when reactions happen after mixed meals with many ingredients.
- Can guide follow-up testing for related legumes or cross-reactive patterns when results are positive.
- Helps you and your clinician decide whether supervised oral food challenge is worth considering.
- Provides a baseline you can recheck if your allergy history changes or after a period of avoidance.
- Pairs well with PocketMD guidance so you can interpret results in context rather than in isolation.
What is Red Kidney Bean (F287) IgE?
Red Kidney Bean (F287) IgE is a “specific IgE” blood test. It measures how much IgE in your blood binds to proteins associated with red kidney beans. IgE is the antibody class involved in immediate-type allergic reactions, which is why this test is used in food allergy evaluation.
A higher specific IgE level suggests your immune system recognizes bean proteins, which is called sensitization. Sensitization is not the same thing as a proven clinical allergy. Some people have detectable IgE but tolerate the food, while others react strongly even with modest IgE levels.
Your result is most meaningful when it is interpreted with your reaction history, the timing of symptoms after eating, and whether you have other allergic conditions such as asthma, allergic rhinitis, or eczema.
Sensitization vs. allergy
A blood test can show that your immune system has made IgE to a food, but it cannot confirm what will happen when you eat that food. The diagnosis of food allergy is based on a consistent history of symptoms after exposure, and sometimes a supervised oral food challenge when the risk is acceptable.
Legume cross-reactivity
Beans are part of the legume family. Some people have IgE that recognizes similar proteins across legumes, which can lead to multiple positive tests. Cross-reactivity does not always translate into real-world reactions to every legume, so your clinician may prioritize testing and food trials based on what you actually eat and what has caused symptoms.
What do my Red Kidney Bean (F287) IgE results mean?
Low Red Kidney Bean (F287) IgE
A low or undetectable result makes an IgE-mediated allergy to red kidney bean less likely, but it does not rule it out completely. If your symptoms are very convincing (for example, immediate hives or breathing symptoms after eating beans), your clinician may still consider additional evaluation. Non-IgE reactions, food intolerance, or reactions to another ingredient in the meal can also explain symptoms when IgE is negative.
In-range / negative Red Kidney Bean (F287) IgE
Most labs report a reference range where results below a cutoff are considered negative. In that setting, your immune system is not showing measurable IgE binding to red kidney bean proteins at the time of testing. If you are avoiding beans and want to reintroduce them, a negative test can be reassuring, but reintroduction decisions should still consider your history and risk tolerance.
High Red Kidney Bean (F287) IgE
A higher result means you are sensitized to red kidney bean, and the likelihood of clinical allergy generally increases as IgE rises. However, there is no single number that guarantees a reaction or predicts severity for every person. Your clinician may use this result to decide whether strict avoidance is appropriate, whether to test related foods, and whether an oral food challenge is safe or necessary.
Factors that influence Red Kidney Bean (F287) IgE
Recent exposure is not required for IgE to be detectable, but levels can change over time, especially in children or after long-term avoidance. Having multiple allergies, uncontrolled eczema, or high total IgE can increase the chance of low-level positives that do not match real reactions. Cross-reactive carbohydrate determinants (CCD) can also cause positive results that are clinically irrelevant, which is why a CCD IgE test is sometimes used as a follow-up. Medications like antihistamines do not typically affect blood IgE results, but they can mask symptoms and complicate history-based interpretation.
What’s included
- Red Kidney Bean (F287) Ige
Frequently Asked Questions
Do I need to fast for a Red Kidney Bean (F287) IgE blood test?
Fasting is not usually required for specific IgE testing. If you are getting other labs at the same visit (like lipids or glucose), those tests may have fasting instructions, so follow the directions for your full order.
What does a positive red kidney bean IgE mean?
A positive result means your immune system has made IgE that binds to red kidney bean proteins (sensitization). It increases suspicion for an IgE-mediated allergy, but it does not prove you will react when you eat beans. Your symptom history and, in some cases, supervised oral food challenge are what confirm clinical allergy.
Can I have a negative IgE test and still react to beans?
Yes. A negative test makes IgE-mediated allergy less likely, but it does not exclude it in every case. Some reactions are non-IgE mediated, and sometimes the trigger is another ingredient or a contaminant in the meal rather than the beans themselves.
How is this different from a skin prick test?
Both tests look for IgE sensitization, but they measure it in different ways. Skin testing measures a local skin response to an allergen extract, while this blood test measures IgE in your bloodstream. Either can be useful, and your clinician may choose based on your history, medications, skin conditions, and access.
Could a positive result be from cross-reactivity with other legumes?
Yes. Legumes share some similar proteins, and cross-reactivity can cause multiple positives on testing even if you only react to one food. This is why your real-life reaction history and careful food-by-food evaluation matter more than a long list of positives.
What is CCD (cross-reactive carbohydrate determinant) and why would I test it?
CCD refers to carbohydrate structures found on many plants and pollens that can cause IgE binding in lab tests without causing meaningful symptoms when you eat the food. If you have several unexpected low-positive plant food IgE results, a CCD IgE test can help your clinician judge whether some positives may be false positives in terms of clinical allergy.
When should I retest red kidney bean IgE?
Retesting is often considered when your clinical situation changes, such as after a long period of avoidance, after a reaction, or when monitoring whether a childhood food allergy may be resolving. Many clinicians recheck at intervals like 6–12 months in children or longer in adults, but the right timing depends on your history and risk.