Are IgG blood tests for food allergies effective in the diagnosis and treatment of food allergy? We have always limited our diagnostic testing to IgE Cap Rast testing. Thank you for your time.


Thank you for your inquiry.

As you can see from the statement issued by the American Academy of Allergy, Asthma, and Immunology which is copied for you below, measurement of specific IgG antibodies to foods is an unproven technique. It has no documented validity in regards to the workup of food allergy.

Thank you again for your inquiry and we hope this response is helpful to you.

AAAAI Work Group Report: Current Approach to the Diagnosis and Management of Adverse Reactions to Foods

October 2003
Some tests are considered unproven in regard to the diagnosis of specific food allergies. Those for which there is no evidence of validity include provocation-neutralization, cytotoxic tests, muscle response testing (applied kinesiology), electrodermal testing, the “reaginic” pulse test and chemical analysis of body tissues. Measurement of specific IgG antibodies to foods is also unproven as a diagnostic tool.

Phil Lieberman, M.D.

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AAAAI - American Academy of Allergy Asthma & Immunology