Lab test

Walnut Allergy Test - Nut Allergies

A walnut-specific IgE blood test detects antibodies the immune system may produce against proteins in walnuts.

Typical price

From $49

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

A walnut-specific IgE blood test detects antibodies the immune system may produce against proteins in walnuts. It is a screening tool for suspected tree nut allergy, not a diagnosis by itself. A clinician may order it after a reaction to walnut, when reviewing a tree nut panel, or when a person's history suggests sensitivity to walnuts or related nuts. Testing uses a single blood sample.

• Walnut-specific IgE Antibodies produced in response to walnut proteins, used to assess sensitization.

• Hives, itching, or swelling after eating walnuts
• Throat tightness or breathing symptoms after tree nut exposure
• Digestive symptoms shortly after walnut intake
• Testing as part of a tree nut allergy panel
• A history of reactions to other tree nuts such as pecan

• No fasting is required for most IgE allergy tests
• Tell the collector about antihistamines or other medications you take
• Stay hydrated before the blood draw
• One blood sample is typically sufficient

An elevated walnut-specific IgE level may indicate sensitization to walnut proteins and can be associated with allergic reactions, some of which may be severe. A positive result alone does not confirm a clinical allergy, and a low level does not fully exclude one. Walnut is related to pecan, so cross-reactivity is possible; a healthcare provider should interpret results with your history.

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