Immunoglobulin M, Qn, Serum

Immune System

A healthy result should fall into the range 40 - 230 mg/dL.

Immunoglobulin M (IgM), which is found mainly in the blood and lymph fluid, is the first antibody to be made by the body to fight a new infection. Expressed on the surface of B cells (monomer) and in a secreted form (pentamer) with very high avidity (forms multiple binding sites with antigen). Eliminates pathogens in the early stages of B-cell mediated (humoral) immunity before there is sufficient IgG. 

Immunoglobulin M, Qn, Serum result calculator

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What does it mean if your Immunoglobulin M, Qn, Serum result is too low?

Low levels occur in multiple myeloma, some types of leukemia, and in some inherited types of immune diseases. Some patients are asymptomatic, while others develop serious infections. This deficiency is usually discovered during the investigation of other conditions.

What does it mean if your Immunoglobulin M, Qn, Serum result is too high?

Can indicate that IgM MGUS, Waldenstrom's macroglobulinemia, early viral hepatitis, mononucleosis, rheumatoid arthritis, kidney damage (nephrotic syndrome), or a parasite infection is present. Because IgM antibodies are the type that form when an infection occurs for the first time, high levels of IgM can mean a new infection is present.

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