Wheat IgE

Measures IgE antibodies to wheat. A raised result is common in people with grass pollen allergy and does not confirm wheat allergy by itself.

AI-verified against cited sources. Awaiting expert reviewAlso called f4, f004LOINC 6276-0

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What it is

This test measures IgE antibodies to wheat (Triticum aestivum, ImmunoCAP f4). Wheat allergy can cause hives, stomach upset, breathing symptoms or, less often, serious reactions. One form, wheat-dependent exercise-induced anaphylaxis, happens when exercise follows a meal with wheat. Wheat is also a grass, so IgE made against grass pollen often shows up as a positive wheat result in people who eat wheat without any trouble. This test looks at wheat as a whole, so it cannot tell these situations apart on its own.

Why it matters

Many people who are sensitized to wheat can eat it safely, so a positive result alone does not mean you need to avoid wheat. It matters most when it fits your history of reactions. Some labs add tests for individual wheat proteins, such as Tri a 19 (omega-5 gliadin), which is linked to the exercise-related form and to more severe reactions. A clinician reads your result with your history and sometimes a supervised food challenge.

If it’s high

A level above your lab's range means your body has made more IgE to wheat. It shows sensitization. It does not tell whether you have a wheat allergy, a pollen-related positive result, or neither.

Common causes

IgE that comes from grass pollen allergy, a very common reason for a positive wheat result in people who eat wheat without problems
Sensitization to wheat without any symptoms
A true wheat allergy, including the exercise-related form
IgE that also reacts with related grains such as rye and barley
Breathing in flour dust, for example at work in a bakery

What can help

Ask an allergist whether a test for omega-5 gliadin (Tri a 19) would help
If you have grass pollen allergy, ask whether your wheat result could be related to it before you cut wheat from your diet
Ask what to do about wheat and other grains while you wait for answers, and follow the plan your clinician gives you
Tell your clinician if reactions have happened after exercise that followed a meal

Usual ranges

What labs print as the reference range, by who was tested. Ranges differ a little between labs, so the range on your own report is the one your result is judged against.

For adults: 0–0.09 kU/L. Source: ARUP Laboratories, Mayo Clinic Laboratories, U.S. Food and Drug Administration.

Adults (this one applies)0–0.09 kU/L
Sources: ARUP Laboratories, Mayo Clinic Laboratories, U.S. Food and Drug Administration

ImmunoCAP IgE classes (ARUP Laboratories)

Class 0: no significant level foundbelow 0.1 kU/L
Class 0/1: clinical relevance undetermined0.1 to under 0.35 kU/L
Class 1: low0.35 to under 0.71 kU/L
Class 2: moderate0.71 to under 3.51 kU/L
Class 3: high3.51 to under 17.51 kU/L
Class 4: very high17.51 to under 50.01 kU/L
Class 5: very high50.01 to under 100.01 kU/L
Class 6: very high100.01 and above kU/L

What can affect your result

Grass pollen allergy, which often causes a positive wheat result without a wheat allergy
Cross-reactivity with rye and barley, which belong to the same plant group
Age: many children with wheat allergy outgrow it by their teens
Which wheat proteins your IgE targets, which a whole-wheat test cannot show
The lab and test brand, because results from different systems are not directly comparable
Where a lab draws its cutoff (0.10 or 0.35 kU/L)
Different labs and test brands give different numbers for the same blood sample, so compare results from the same lab and system.
Some labs reject hemolyzed, icteric or lipemic samples (ARUP).

Slow. It usually shifts over months to years, not weeks.

When to talk to a clinician

Call 911 or your local emergency number right away if any of these happen after eating wheat or a food that may contain it, or after exercise that follows a meal with wheat: trouble breathing, swelling of the lips, tongue or throat, dizziness or fainting, repeated vomiting, or widespread hives. Do not wait for a lab result. For milder or past symptoms, talk with a clinician or allergist even if this result is in the usual range.

Questions you could ask

Should I have a plan in case of an accidental exposure?
Could my wheat result be related to grass pollen?
Would a test for omega-5 gliadin (Tri a 19) help?
What should I do about wheat and other grains while we find out more?
My result is in the usual range but I have had symptoms after wheat. What should we do next?

Questions people ask

I have grass pollen allergy and my wheat test is positive. Do I need to avoid wheat?

Not necessarily. Wheat is a grass, and IgE made against grass pollen can show up as a positive wheat result. One source says up to 60% of people with grass allergy are sensitized to wheat but can eat it. Ask your allergist before you cut wheat out, since your history and sometimes a supervised food challenge decide this.

What is Tri a 19 (omega-5 gliadin)?

It is a wheat protein that survives cooking. IgE to it is linked to wheat-dependent exercise-induced anaphylaxis, a reaction that can happen when exercise follows eating wheat, and to more severe reactions. Some labs offer it as a separate test.

Does this test check for celiac disease or gluten sensitivity?

No. It looks for IgE, which is part of an allergy. Celiac disease and non-celiac gluten sensitivity do not work through IgE and are checked with different tests.

Show the science and sources

For clinicians and researchers

Quantitative IgE to a whole wheat extract (Triticum aestivum, ImmunoCAP f4). ARUP lists it as Allergen, Food, Wheat and reports it in kU/L with LOINC 6276-0. Reported as allergen-specific IgE by ImmunoCAP fluoroenzyme immunoassay in kUA/L, with calibrators traceable to the WHO IgE reference (IRP 75/502 or the 3rd International Standard 11/234). The FDA-reviewed system has a limit of quantitation of 0.1 kUA/L and reports up to 100 kUA/L; its maker recommends a 0.35 kUA/L cutoff and tells each lab to set its own range (FDA review K173726). Wheat proteins fall into gluten (gliadins, glutenins) and non-gluten groups (alpha-amylase inhibitors, lipid transfer proteins), and about 28 allergens have been identified (Thermo Fisher). Tri a 19 (omega-5 gliadin, ImmunoCAP f416) is a major, heat-stable allergen recognized by 50 to 70% of wheat-allergic patients; sensitization to it is reported as a marker for wheat-dependent exercise-induced anaphylaxis, can indicate a risk of severe reactions, and in children may indicate persistence into adulthood. Tri a 14 (a lipid transfer protein, f433) is a heat-stable minor allergen; Tri a 27 and Tri a 28 are linked to baker's asthma. Being sensitized to wheat is common mainly because of cross-reactivity with grass pollen: up to 60% of grass-allergic people are sensitized to wheat but tolerate it, and a positive wheat test needs follow-up to know whether it is clinically relevant (Thermo Fisher). A 2026 review notes that whole-extract wheat IgE is more prone to false positives where grass pollen allergy is common, that omega-5 gliadin IgE is essential for diagnosing the exercise-related form, and that clinical cross-reactivity with other Triticeae grains is uncommon in children. IgE tests do not look for celiac disease, non-celiac gluten sensitivity or eosinophilic esophagitis, which are not IgE-mediated. Sensitization alone is not sufficient to define food allergy, and sIgE tests alone are not diagnostic (NIAID 2010).

LOINC 6276-0 (primary), 107525-8. Specimen: serum.

Sources

Allergen, Food, Wheat (ARUP test 0055034), ARUP Laboratories
f4 Wheat (Allergen Encyclopedia), Thermo Fisher Scientific (Phadia)
Wheat Allergy: Clinical Phenotypes, Diagnostic Approaches, and Management Strategies, Allergy, Asthma & Immunology Research (2026)
ImmunoCAP Specific IgE (allergen component f447) 510(k) decision memorandum K173726, U.S. Food and Drug Administration
Guidelines for the Diagnosis and Management of Food Allergy in the United States: Report of the NIAID-Sponsored Expert Panel, Journal of Allergy and Clinical Immunology (2010)
Wheat, IgE, Serum (test ID WHT), Mayo Clinic Laboratories
Wheat (test 602459), Labcorp

AI-verified against cited sources. Awaiting expert review. Last reviewed 2026-10-03. How we build and check these pages.