What is immunoglobulin E? Immunoglobulin E (IgE) is an antibody produced during a type I hypersensitivity reaction to an allergen. (See DermNet's page Allergies explained.) A schematic for the type I reaction pathway is shown below [1].

Understanding the Context

IgE antibodies are normally found in small amounts in the blood. A higher level than normal infers an allergic disorder may be present [2]. What is a type I ...