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This test detects IgE antibodies against walnut allergens in your blood. Tree nut allergies like walnuts can cause reactions ranging from oral itching and swelling to severe anaphylaxis. A positive result indicates a walnut allergy and suggests caution with other tree nuts due to cross-reactivity. This test helps confirm a suspected allergy and is essential for safe food choices and emergency preparedness, especially since tree nut allergies often persist throughout life.