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Immunoglobulin M (IgM) Antibodies

Immunoglobulin M (IgM) antibodies are proteins made by the body's natural defense system (immune system). They attack and destroy things that they recognize as different from the body's normal healthy tissues, such as bacteria and viruses.

IgM antibodies are found in blood and lymph fluid and are very important in fighting infections. They are the first of the five major types of antibodies made in response to an infection, and are the largest of the antibodies. They also cause other immune system cells to fight infection.

By Healthwise Staff
Primary Medical Reviewer E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer Joseph O'Donnell, MD - Hematology, Oncology
Current as of August 6, 2012

WebMD Medical Reference from Healthwise

Last Updated: August 06, 2012
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.