Lab test

Peanut Allergy Test - Legume/Nut Allergy

A peanut-specific IgE blood test detects antibodies the immune system may produce against proteins in whole peanut, including foods such as peanut butter.

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 peanut-specific IgE blood test detects antibodies the immune system may produce against proteins in whole peanut, including foods such as peanut butter. It is a screening tool for suspected peanut allergy, not a diagnosis on its own. A clinician may order it after a reaction, when reviewing a nut or legume panel, or to help assess whether further evaluation is needed. Peanut is a legume and reactions can sometimes be severe.

• Whole peanut-specific IgE Antibodies produced in response to whole peanut proteins, used to assess sensitization.

• Hives, itching, or swelling after eating peanut or peanut-containing foods
• Throat tightness, wheezing, or breathing difficulty after peanut exposure
• Digestive symptoms shortly after eating peanut butter or peanut snacks
• Testing as part of a nut or legume allergy panel
• A history of reactions and a need to clarify peanut sensitization

• 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 enough for the whole peanut-specific IgE assay

An elevated whole peanut-specific IgE level may indicate sensitization to peanut 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 rule one out. Because peanut allergy can be serious, discuss any result with a healthcare provider who can assess your full history.

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