Assessments of specific IgE via skin prick tests or in vitro methods

The use of skin prick tests and in vitro identification of specific IgE is discussed later in this chapter. Such tests are usually insufficiently sensitive or specific to be used in isolation for the diagnosis of food allergies. It is suggested that the only reason for not proceeding to DBPCFC is if there is strong suspicion that a likely food substance caused an anaphylactic reaction, and positive evidence of specific IgE. Open challenge and if necessary DBPCFC should follow negative skin prick tests. Positive tests in the presence of non-life-threatening symptoms should be followed with a DBPCFC.

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