Blood tests: In those situations where skin tests cannot be done, a doctor may use blood tests such as the RAST and the ELISA. These tests measure the presence of food-specific IgE antibodies in the blood of patients, but they cost more than skin tests, and the results are not available immediately.

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blood tests: in those situations where skin tests cannot be done, a doctor may use blood tests such as the rast and the elisa. these tests measure the presence of food-specific ige antibodies in the blood of patients, but they cost more than skin tests, and the results are not available immediately.