IgE: Immunoglobulin E Class

Secondary Antibodies

Subclass and binding site selection simplified

Human immunoglobulin E (IgE) is expressed on the surface of mature B cells. Human immunoglobulin IgE is the least abundant Ig in the serum and does not activate the complement pathway.

Fragment crystallization (Fc) receptors for IgE are found on eosinophils and IgE binds Fc receptors on mast cells and basophils even before interacting with antigen. As a result of its binding to basophils and mast cells, IgE is involved in allergic reactions. This happens when allergen is bound to IgE on cells and releases various pharmacological mediators which cause allergies.

IgE Immunoglobulin Class E: IgE

Heavy chain


Light chain

κ or λ

Molecular formula

ε2κ2 or ε2λ2





Abundance in serum (in relation to total immunoglobulins present)


Carbohydrate content


Concentration in serum

10 - 400 ng/ml

IgE subclasses


Heavy chain MW (kDa)


Light chain MW (kDa)


Total MW (kDa)



Basophils and mast cells (in saliva and nasal secretions)


Protects against parasites

Antibodies for IgE

Bio-Rad offers a range of human immunoglobulin antibodies for the IgE isotype. In addition to human, we also offer IgE antibodies for a wide range of other target species. Below you will find a list of all of our IgE antibodies. Use the buttons/filters to identify the antibody that fits your exact requirements.

IgE (Immunoglobulin E) Antibodies

    DescriptionSpecificityTargetFormatHostIsotypeClone Applications Citations Product Type Code

    Further Reading

    For a full overview of Immunoglobulin classes please visit our Immunoglobulins Classes / Sub-classes page. Alternatively you can view the following individual types:

    Learn about Secondary Antibody Specific Binding Locations.