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When is an immune complex assay used to diagnose food allergies?

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An immune complex assay is sometimes done on patients suspected of having food allergies to see if there are complexes of certain antibodies bound to the food allergen in the bloodstream. It is said that these immune complexes correlate with food allergies, but the formation of such immune complexes is a normal offshoot of food digestion, and everyone, if tested with a sensitive enough measurement, has them. To date, no one has conclusively shown that this test correlates with allergies to foods.

From: Food Allergy and Food Intolerance WebMD Medical Reference

SOURCES:

The National Institute of Allergy and Infectious Diseases: "Fact Sheet: Food Allergy and Intolerances."  UpToDate. American Academy of Allergy Asthma & Immunology.

Reviewed by Brunilda Nazario on October 29, 2018

SOURCES:

The National Institute of Allergy and Infectious Diseases: "Fact Sheet: Food Allergy and Intolerances."  UpToDate. American Academy of Allergy Asthma & Immunology.

Reviewed by Brunilda Nazario on October 29, 2018

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How is the IgG subclass assay used to diagnose food allergies?

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