Lab test

Soy Allergy Test - Soybean Allergy

A soy-specific IgE blood test measures antibodies the immune system may produce against proteins in soybean and soy products.

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 soy-specific IgE blood test measures antibodies the immune system may produce against proteins in soybean and soy products. It is a screening tool for suspected soy allergy rather than a diagnosis on its own. A clinician may order it after a reaction to soy, as part of a broader food or legume panel, or when symptoms suggest sensitivity to soybeans and their byproducts.

• Soybean (soy)-specific IgE Antibodies produced in response to soybean proteins, used to assess sensitization.

• Hives, itching, or swelling after eating soy or soy-containing foods
• Digestive symptoms following soy milk, tofu, or soy-based products
• Eczema or skin symptoms that flare around soy intake
• Testing as part of a broader food or legume allergy panel
• A history of reactions to other legumes such as peanut

• No fasting is required for most IgE allergy tests
• Inform the collector about antihistamines or other medications you take
• Drink water before the blood draw
• No dietary preparation is needed before testing

An elevated soy-specific IgE level may indicate sensitization to soybean proteins and can be associated with allergic symptoms, but a positive result alone does not confirm a clinical allergy. A low or undetectable level makes allergy less likely without excluding it. Because soy appears in many processed foods, a healthcare provider should interpret the result with your history and diet.

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