A Low IgM Level

A Low IgM Level: Overview

IgM stands for immunoglobulin M, one of the classes of immunoglobulins (also called antibodies) that are in the blood.  IgM is an antibody that remains in the bloodstream where it can kill bacteria that enter the blood.

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Causes and Development

Low levels of IgM occur in multiple myeloma and some types of leukemia.

Diagnosis and Tests

The 'low', 'normal' and 'high' ranges vary with age, and are also lab-specific.  However, a reasonable normal range is 45-250mg/dl.

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Low IgM Level:

Risk factors for A Low IgM Level:


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Weak or unproven link: may increase risk of
Weak or unproven link:
may increase risk of