IgG deficiency
Encyclopedia
IgG deficiency is a form of dysgammaglobulinemia
Dysgammaglobulinemia
Dysgammaglobulinemia is a type of immune disorder characterized by a reduction in some types of gamma globulins.It is distinguished from hypogammaglobulinemia, which is a reduction in all types of gamma globulins....

 where the proportional levels of IgG are reduced relative to other immunoglobulin.

It is possible to have a deficiency of one or more specific subclass(es) of IgG.
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