IgE antibodies

What Is an Immunoglobulin E (IgE) Test?

An immunoglobulin E (IgE) test measures the level of IgE, a type of antibody. Antibodies (also called immunoglobulins) are proteins the immune system makes to recognize and get rid of germs. The blood usually has small amounts of IgE antibodies. Higher amounts can be a sign that the body overreacts to allergens, which can lead to an allergic reaction.

IgE levels can also be high when the body is fighting an infection from a parasite and from some immune system conditions.

Why Are IgE Tests Done?

Doctors may order an IgE test if a child has signs of a possible allergy, immune system problem, or infection with a parasite.