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Immunoglobulin G （IgG） is one of the most abundant proteins in serum. IgG is important for our defense against microorganisms. IgG molecules are produced by B lymphocytes, which are part of our adaptive immune response. IgG molecules have two independent functions: binding to pathogens that cause reactions and recruiting other cells and molecules to destroy antigens.
Immunoglobulin G （IgG） is the main immunoglobulin component in serum, accounting for about 75% of the total immunoglobulin content in serum, with normal levels in adult blood ranging from 8-17 mg/ml. There are 4 subclasses: IgG1 （60~70%）, IgG2 （15~20%）, IgG3 （5~10%） and IgG4 （1~7%）.