Lab test

Onion Allergy Test - Food Allergies

An onion-specific IgE blood test measures antibodies the immune system may produce against proteins found in onion.

Typical price

From $49

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

An onion-specific IgE blood test measures antibodies the immune system may produce against proteins found in onion. It is a screening tool for suspected food allergy, not a diagnosis on its own. A clinician may order it after a reaction, as part of a broader food allergy panel, or when a person's history suggests sensitivity to onion or related alliums. Results are interpreted together with symptoms and other findings rather than in isolation.

• Onion-specific IgE Antibodies produced in response to onion proteins, used to assess sensitization.

• Hives, itching, or swelling after eating onion or dishes prepared with it
• Digestive symptoms that appear shortly after meals containing onion
• A history of reactions to related alliums such as garlic, leek, or chives
• Evaluation as part of a wider food allergy workup
• Persistent eczema or allergic symptoms without a clear trigger

• No fasting is required for most IgE allergy tests
• Tell the phlebotomist about antihistamines or other medications you take, as some can affect testing
• Drink water before the blood draw to make the sample easier to collect
• Usually only a single blood sample is needed

An elevated onion-specific IgE level may indicate that the immune system has been sensitized to onion proteins and can be associated with allergic symptoms, though a positive result alone does not confirm a clinical allergy. A low or undetectable level makes allergy less likely but does not rule it out. Because results depend on context, discuss them with a healthcare provider before drawing conclusions.

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