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Food Allergy Tests

In order to properly diagnose your food allergy, your doctor may order either a skin-prick test, or a blood test. Both tests can determine your specific allergen.

Skin-Prick Test

Skin-prick tests are the primary means of diagnosing an allergy. In a skin-prick test, a tiny bit of each potentially problematic food is inserted under the skin. If the skin develops a bump or other noticeable change of appearance, you are allergic to that food. Results can usually be seen in 10 to 20 minutes


Depending on your personal medical history and the problem at hand, your doctor may order a blood test. A RAST test (short for "radioallergosorbent test") can measure your immune system’s response to an allergen by detecting the amount of IgE antibodies made in response to suspected food proteins. In a RAST test, a sample of the patient’s blood is added to the suspected food protein, and then tested for the amount of IgE antibodies made in response.

Content licensed from:

Written by: the Healthline Editorial Team
Medically reviewed : Stephanie Burkhead, MPH

This feature is for informational purposes only and should not be used to replace the care and information received from your health care provider. Please consult a health care professional with any health concerns you may have.
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