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Human IgM (immunoglobulin M) is expressed on the surface of immature and mature B cells as monomers. IgM is the third most abundant human immunoglobulin.
IgM is also the first human immunoglobulin to be made by a fetus and virgin B cells which are challenged with antigen.
IgM is a strong complement activator and agglutinator due to its pentameric structure and binds fragment crystallization (Fc) receptors.
κ or λ
(μ2κ2)5 or (μ2λ2)5
Abundance in serum (in relation to total immunoglobulins present)
Concentration in serum
0.5 - 2.0 mg/ml
Heavy chain MW (kDa)
Light chain MW (kDa)
Total MW (kDa)
Primary response antibody
Bio-Rad offers a range of human immunoglobulin antibodies for the IgM isotype. In addition to human, we also offer IgM antibodies for a wide range of other target species. Below you will find a list of all of our IgM antibodies. Use the buttons/filters to identify the antibody that fits your exact requirements.
For a full overview of Immunoglobulin classes please visit our Immunoglobulins Classes / Sub-classes page. Alternatively you can view the following individual types: