Immunoglobulin G (IgG) antibodies

Immunoglobulin G (IgG) 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.

IgG antibodies are found in all body fluids and are very important in fighting infections. They are the most common of the five major types of antibodies. IgG antibodies can cross the placenta in a pregnant woman to help protect the fetus.

Last Updated: August 19, 2008

Author: Maria G. Essig, MS, ELS

Medical Review: Kathleen Romito, MD - Family Medicine & Brian Leber, MDCM, FRCPC - Hematology

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