What Is an IgG Antibody?
Antibodies are proteins made by the immune system to destroy foreign invaders. There are five major types of antibodies: immunoglobulin A (IgA), immunoglobulin G (IgG), immunoglobulin M (IgM), immunoglobulin E (IgE) and immunglobulin D (IgD). An IgG antibody helps to battle bacterial and viral infections. Comprising up to 80% of the all of these essential proteins, it is the smallest, yet most abundant, human antibody. Found in all bodily fluids, IgG is the only antibody that can protect a fetus by passing through the mother’s placenta.
