Allergen Specific IgE Horseradish Biomarker Testing
It measures IgE antibodies to horseradish to help assess allergy risk; order through Vitals Vault with Quest collection and PocketMD support.
With Vitals Vault, you have access to a comprehensive range of biomarker tests.
The Allergen Specific IgE Horseradish test is a blood test that looks for IgE antibodies your immune system has made against horseradish proteins. It is used when you want objective evidence to support (or rule out) an IgE-mediated allergy pattern.
Horseradish reactions can be confusing because the same food can cause different problems in different people. Some reactions are true allergies, while others are irritation from spicy compounds, reflux, or non-IgE sensitivities that do not show up on IgE testing.
Your result is most useful when it is interpreted alongside your symptoms and timing of exposure. A lab value alone cannot diagnose an allergy, but it can help you and your clinician decide what to avoid, what to challenge, and what to test next.
Do I need a Allergen Specific IgE Horseradish test?
You may consider this test if you notice repeatable symptoms after eating horseradish or foods that commonly contain it (for example, sauces, marinades, or certain prepared meats). Symptoms that raise more concern for an IgE-mediated reaction include hives, itching, lip or tongue swelling, throat tightness, wheezing, vomiting soon after eating, or lightheadedness.
This test can also be helpful if you have a history of food allergy and you are trying to clarify whether horseradish is a trigger, especially when reactions are inconsistent or when multiple foods are eaten together. If you have eczema, asthma, or allergic rhinitis, specific IgE testing can sometimes help map out patterns, but it is most accurate when you start with a clear exposure story.
You may not need this test if your only issue is burning in the mouth, watery eyes from the pungency, or heartburn hours later. Those symptoms can be real and uncomfortable, but they often reflect irritation or reflux rather than IgE allergy.
If you have ever had a severe reaction (trouble breathing, fainting, or rapid progression of symptoms), treat that as urgent and discuss an emergency plan with a clinician. Testing supports clinician-directed care and safer decision-making, but it is not a substitute for medical evaluation.
This is typically performed as a CLIA-validated allergen-specific IgE immunoassay; results support clinical assessment and are not a standalone diagnosis of food allergy.
Lab testing
Order the Allergen Specific IgE Horseradish test and schedule your draw.
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 an Allergen Specific IgE Horseradish test directly and complete your blood draw at a Quest collection site. That can be useful when you are trying to confirm a suspected trigger, document a baseline before making diet changes, or decide whether broader allergy testing is worth it.
After your results post, you can use PocketMD to talk through what the number may mean in the context of your symptoms, timing, and other allergic conditions. If your result suggests sensitization, PocketMD can help you plan practical next steps to discuss with your clinician, such as targeted avoidance, label-reading strategies, or whether supervised oral challenge or additional testing makes sense.
If you are tracking a known allergy over time, Vitals Vault also makes it straightforward to reorder the same test so you can compare trends using the same lab network.
- Order online and schedule a draw at a Quest location
- Clear, shareable results you can bring to your clinician
- PocketMD support to interpret results and plan follow-up
Key benefits of Allergen Specific IgE Horseradish testing
- Helps determine whether your immune system shows IgE sensitization to horseradish.
- Adds objective data when symptoms are vague or when multiple foods are eaten together.
- Supports safer planning for avoidance versus reintroduction with clinician guidance.
- Can reduce unnecessary long-term restriction when the result is negative and history is low-risk.
- Helps prioritize follow-up testing (related foods, spices, or cross-reactive plant allergens) based on your pattern.
- Provides a baseline value you can reference if reactions change over time.
- Pairs well with PocketMD so your number is interpreted in context rather than in isolation.
What is Allergen Specific IgE Horseradish?
Allergen-specific IgE is a type of antibody your immune system can produce when it becomes sensitized to a particular allergen. In this test, the lab measures IgE that binds to horseradish proteins in your blood sample.
A positive result means your immune system recognizes horseradish as an allergen (sensitization). Sensitization can increase the likelihood of an IgE-mediated reaction, but it does not guarantee you will have symptoms every time you eat the food. A negative result makes an IgE-mediated horseradish allergy less likely, although no test is perfect.
Because horseradish is pungent, it can also cause non-allergic irritation of the mouth, nose, and eyes. That is one reason your symptom story and timing matter so much when you interpret this test.
IgE allergy vs irritation or intolerance
IgE-mediated reactions usually occur quickly, often within minutes to 2 hours of exposure, and can include hives, swelling, wheeze, or vomiting. Irritation from spicy foods tends to cause burning, tearing, or nasal symptoms without hives or swelling, and it does not involve IgE antibodies. Food intolerance and reflux can cause delayed symptoms and will not be captured by specific IgE testing.
Why a single food IgE test is sometimes ordered
Single-allergen testing is most useful when you have a clear suspected trigger and you want to avoid broad panels that can create confusing positives. Targeted testing can help you focus your next steps and reduce the chance of over-interpreting low-level sensitizations that are not clinically relevant.
What do my Allergen Specific IgE Horseradish results mean?
Low (or undetectable) horseradish-specific IgE
A low or undetectable result generally means an IgE-mediated horseradish allergy is less likely. If your symptoms are mild and inconsistent, this can support a plan to look for other explanations such as irritation, reflux, or another ingredient in the meal. If your history includes convincing immediate reactions, your clinician may still consider additional evaluation, because rare false negatives can occur. In higher-risk situations, supervised oral challenge may be discussed rather than self-testing at home.
In-range results (interpreted with your lab’s reference cutoffs)
Specific IgE tests are usually reported as a numeric value with a positive/negative interpretation based on the lab’s cutoff, and sometimes grouped into “classes.” There is not a universal “optimal” number that applies to everyone, because risk depends on your symptoms, how much you ate, and your other allergic conditions. If your value is near the cutoff, your clinician may treat it as borderline and rely more heavily on your exposure history. In many cases, the most useful next step is clarifying timing and reproducibility rather than chasing small changes in the number.
High horseradish-specific IgE
A higher result suggests stronger sensitization and can increase the likelihood that horseradish is a true trigger, especially if your symptoms occur soon after exposure. However, the number does not reliably predict reaction severity, and it cannot tell you whether a future reaction will be mild or severe. If you have had systemic symptoms (hives plus breathing or blood pressure symptoms), bring your result to a clinician promptly to discuss an action plan. Avoidance decisions should also consider hidden sources, such as condiments and prepared foods.
Factors that influence horseradish-specific IgE results
Your result can be influenced by your overall allergic tendency (atopy), including eczema, asthma, and seasonal allergies, which can raise the chance of sensitization. Cross-reactivity can also play a role, where IgE made against one plant allergen binds to similar proteins in another, creating a positive result that may not match real-world symptoms. Recent exposures do not usually “spike” IgE immediately the way some people expect; IgE reflects immune memory more than a single meal. Medications like antihistamines typically do not affect blood IgE results (they mainly affect skin testing), but immune-modulating therapies should be discussed with your clinician when interpreting any allergy test.
What’s included
- Allergen Specific Ige Horseradish
Frequently Asked Questions
Do I need to fast for a horseradish-specific IgE blood test?
Fasting is not typically required for allergen-specific IgE testing. If you are combining this with other labs that do require fasting, follow the instructions for the full order.
Can antihistamines affect my horseradish IgE blood test result?
Antihistamines usually do not change blood-based specific IgE results. They can interfere with skin prick testing, which is a different type of allergy test.
What does a positive horseradish IgE mean if I have never reacted?
A positive result can reflect sensitization without clinical allergy, especially if you have other allergies. In that situation, your clinician may focus on your history and may not recommend avoidance unless you develop symptoms or have other risk factors.
Does a higher IgE number mean a more severe reaction?
Not reliably. Higher values can correlate with a higher likelihood of reacting in some settings, but they do not predict severity for an individual. Your past reactions and coexisting asthma or anaphylaxis history matter more for risk planning.
How soon after a reaction should I test?
You can usually test at any time because specific IgE reflects longer-term immune sensitization rather than a short-lived spike. If you are testing very soon after a first-ever reaction, your clinician may recommend repeat testing later if the result is negative but suspicion remains.
Is this the same as a food sensitivity test?
No. This test measures IgE, which is associated with immediate-type allergy. Many “sensitivity” panels measure IgG or other markers that do not diagnose IgE-mediated food allergy and can be misleading for decision-making.
Should I retest horseradish IgE?
Retesting is most useful when you are monitoring a known allergy over time, reassessing after a period of avoidance, or when your symptom pattern changes. Your clinician can help choose an interval, since meaningful changes usually occur over months rather than days.