Lower the IgE antibody concentration in blood, greater the chances of allergic symptoms.
Blood tests are done to get the concentration of specific IgE antibodies for a certain allergen in blood. Immunoglobulin E (IgE) is an antibody that is produced by the body's immune system in response to a perceived threat. It is one of five classes of immunoglobulins and is normally present in the blood in very small amounts. Higher the IgE antibody value, greater the chance of allergic symptoms.