Food Allergy Profile (15 Foods)

Food allergy is more common, more serious, and more often misidentified than most people realize. A 2019 nationally representative survey estimated that 10.8 percent of United States adults have at least one current food allergy, while nearly 19 percent believe they do. The gap between belief and biology is exactly what this panel is built to close.

This panel screens your blood for IgE antibodies, the specific immune molecules your body makes when it has been primed to attack a particular food protein. The fifteen foods chosen here are responsible for the overwhelming share of allergic reactions in adults, including the foods now legally labeled as major allergens in the United States after sesame was added in 2021.

What This Panel Reveals

Your immune system, when it labels a food as a threat, produces IgE antibodies that bind to mast cells in your skin, gut, and airways. The next time that food enters your body, those primed cells release chemicals that drive symptoms ranging from hives and itching to vomiting, wheezing, and anaphylaxis (a severe, whole-body allergic reaction). The panel measures the level of those antibodies for each food, expressed in kilounits per liter of blood.

The fifteen foods cluster into a few distinct allergy domains. Peanut, the tree nuts (almond, cashew, hazelnut, walnut), and sesame seed cover the lifelong, often severe legume and seed allergies. Cow's milk, egg white, soy, and wheat capture the classic childhood allergens, though many adults retain or develop them. Codfish, salmon, and tuna represent finned fish, while shrimp and scallop represent shellfish, the leading cause of new-onset food allergy in adults.

A positive result means your immune system has been sensitized. It does not, on its own, prove that eating the food will make you sick. The clinical question is always whether sensitization translates into reaction, and the answer depends on your IgE level, your symptoms, and your history.

Sensitization Is Not the Same as Allergy

This is the single most misunderstood point in food allergy testing. Many people have measurable IgE to foods they eat without any symptoms at all. In a large United States cohort, the rate of detectable IgE sensitization to common foods was several times higher than the rate of true clinical allergy. The panel detects the immune fingerprint, not the reaction.

Two implications follow. First, do not stop eating a food just because a test came back positive if you tolerate it without symptoms. Eliminating tolerated foods can cause new allergy to develop on reintroduction. Second, a positive result in the setting of suggestive symptoms is meaningful, and the higher the IgE value, the higher the probability that a real reaction will occur.

How to Read Your Results Together

IgE results are reported numerically, and the number matters. Research by Sampson and colleagues established the food-specific IgE values above which roughly 95 percent of children with corresponding clinical histories will react during a supervised oral food challenge. These thresholds were derived in pediatric studies and are imperfect in adults and vary by lab, but they give a useful frame for interpretation.

Patterns across the panel also matter. A cluster of positive tree nut results often reflects true cross-reactivity, since nut proteins are structurally similar. A positive shrimp result frequently predicts reaction to other crustaceans. Fish allergies, by contrast, are species-specific more often than people assume, which is why the panel separately tests cod, salmon, and tuna.

Use these four interpretation patterns to ground your reading.

• Positive test, clear symptoms after the food: this is a likely true allergy. The number tells you how confident to be.
• Positive test, no symptoms when you eat the food: this is sensitization without allergy. Do not eliminate the food on the test alone.
• Negative test, clear symptoms after the food: consider non-IgE reactions like food intolerance, FPIES (a delayed gut reaction to a food), eosinophilic esophagitis (allergic inflammation of the swallowing tube), or a reaction to a co-eaten ingredient.
• Multiple positives in one food family: cross-reactivity is the likely explanation; component testing or a supervised food challenge can sort out which foods are truly off the table.

When Results Can Be Misleading

A very high total IgE level, common in eczema, asthma, or chronic hay fever, can produce nonspecific positive results across many foods on the panel. Drawing this panel during or shortly after a severe allergic reaction can transiently lower specific IgE values because antibodies are bound up in the reaction itself. Recent immunotherapy can also alter results.

Pollen-food syndrome can create another twist. People allergic to birch or grass pollens may test positive to hazelnut, almond, soy, or wheat through cross-reacting plant proteins, even though they only experience mild oral itching with raw forms of those foods. The panel cannot distinguish a severe peanut allergy from a mild birch-pollen-driven hazelnut sensitivity on its own.

Tracking Over Time

Food-specific IgE levels are not static. Childhood allergies to milk, egg, wheat, and soy resolve in a substantial fraction of children, and falling IgE values are one of the strongest predictors that a food challenge will be tolerated. Adult-onset shellfish, fish, and tree nut allergies are usually persistent, but sensitization without allergy can also wax and wane.

Repeating the panel every twelve to twenty-four months is reasonable if you are tracking a known allergy, considering reintroduction, or watching for new sensitizations. A clear downward trend can support a clinician-supervised food challenge, the only test that definitively confirms or rules out a current allergy.

What to Do with Your Results

Match every positive value to your real-world experience with the food. If you have eaten the food recently and felt fine, the result is sensitization, not allergy, and no action is needed beyond noting it. If you have had reactions, treat the result as confirmation and bring it to a board-certified allergist.

For high-stakes results, especially peanut, tree nut, fish, and shellfish positives, consider component-resolved testing, which measures antibodies to individual proteins within a food. Anti-Ara h 2 antibodies, for example, separate true peanut allergy from birch-driven cross-reactivity with high accuracy. An epinephrine auto-injector prescription is appropriate for anyone with a confirmed allergy to a food capable of causing anaphylaxis.

If your panel is largely negative but your symptoms persist, the answer is not in IgE. Lactose intolerance, fructose malabsorption, celiac disease, histamine intolerance, and FODMAP sensitivity all mimic food allergy without producing IgE. A celiac panel or a structured elimination plan with a clinician is the next step.