Lab test

Oyster Allergy Test - Shellfish Allergy

An oyster-specific IgE blood test detects antibodies the immune system may produce against proteins in oysters.

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 oyster-specific IgE blood test detects antibodies the immune system may produce against proteins in oysters. It is a screening tool used when a shellfish allergy is suspected, not a diagnosis on its own. A clinician may order it after a reaction to oysters or other shellfish, when reviewing a seafood allergy panel, or to help decide whether further evaluation is warranted. Results are interpreted together with the person's history and symptoms.

• Oyster-specific IgE Antibodies produced in response to oyster proteins, used to assess sensitization.

• Hives, itching, or swelling after eating oysters or other shellfish
• Stomach upset, nausea, or vomiting following shellfish meals
• A prior reaction that included throat tightness or breathing difficulty
• Review as part of a broader seafood or shellfish allergy panel
• A history of reactions to mollusks such as clams, mussels, or scallops

• No fasting is required for most IgE allergy tests
• Mention any antihistamines or other medications, since some can interfere with testing
• Stay well hydrated before the blood draw
• One blood sample is generally sufficient for the oyster-specific IgE assay

An elevated oyster-specific IgE level may indicate sensitization to oyster proteins and can be associated with allergic reactions, but a positive result alone does not prove a clinical allergy. A low or undetectable level lowers the likelihood of allergy without excluding it entirely. Cross-reactivity between shellfish species is possible, so a healthcare provider should interpret the result with your history.

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