You will be asked about your symptoms and medical history. A physical exam will be done. Food allergies are often diagnosed based on your own observations. It is a good idea to keep a diary of your symptoms. Note when the symptoms occur and what you have eaten.
Tests may include:
You may be asked to go on an
elimination diet. This should be done under your doctor's care. You will not eat a suspected food. If your symptoms decrease or go away, your doctor may be able to make a diagnosis. If you eat the food and your symptoms come back, the diagnosis is confirmed. This is most often only done in cases of skin irritation or
Scratch Skin Test
A diluted extract of the food will be placed on the skin of your forearm or back. The skin is scratched with a small pick or tiny needles. If there is swelling or redness, an allergic reaction may be present. The doctor will make the diagnosis based on the skin test and your history of symptoms. In rare cases, skin tests can have a severe allergic reaction. This test should only be used under the supervision of a physician or other trained medical personnel. Severe eczema may make this test hard to interpret.
RAST or ELISA Test
Blood tests (RAST or ELISA) may be ordered. These tests measure the level of food-specific IgE in the blood. IgE is a type of protein that the body produces when it is exposed to something to which it is allergic. The presence of IgE in the blood may indicate an allergy, but is not enough to make a diagnosis.
Last reviewed September 2017 by EBSCO Medical Review Board
Marcin Chwistek, MD
Last Updated: 3/17/2015
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