Nut Allergy Blood Test

What this test measures

IgE allergy testing measures antibodies the immune system produces after it has recognized a food protein as a threat. For nuts and seeds, these antibodies can trigger reactions that range from mild to severe. A single blood draw can check several allergens at once, which is why panels are common when the suspected trigger is not obvious or when multiple foods are involved.

This panel covers seven allergens: almond, cashew, coconut, hazelnut, pecan, peanut, and sesame seed. Although peanut is a legume and coconut is a fruit, they are grouped with nuts and seeds because reactions and testing needs often overlap. Each allergen is reported separately with a quantitative IgE level or a reactivity class, so results show which proteins reacted.

Sensitization does not always mean a food will cause symptoms every time. Some people have positive antibodies without a clinical reaction, while others react after only small exposures. Because of this, results are reviewed with the person's history, prior reactions, and any other allergy testing. A qualified healthcare provider decides what the finding means and whether further evaluation is appropriate.

• Almond-specific IgE
• Cashew-specific IgE
• Coconut-specific IgE
• Hazelnut-specific IgE
• Pecan-specific IgE
• Peanut-specific IgE
• Sesame seed-specific IgE
• Total serum IgE
• Quantitative allergen-specific IgE levels
• IgE reactivity classes

Why people order this test

• Investigate symptoms after eating nuts or seeds
• Check for sensitization before introducing these foods
• Clarify which specific nut or seed may be involved
• Follow up on a previous reaction or a family history of allergy
• Review symptoms such as hives, itching, or digestive upset after meals
• Provide objective information before a discussion with a provider

How to prepare

No fasting is needed for this blood test. A sample is drawn from a vein, usually at the arm. Follow any instructions provided by the laboratory, and tell the ordering provider about current medications or prior allergic reactions.

Understanding your results

Results are usually reported within one to three business days. Each of the seven allergens is listed with its specific IgE level or reactivity class. An elevated value indicates sensitization, and a healthcare provider interprets it together with symptoms and history.