What is IgG subclass deficiency associated with hypogammaglobulinemia?

Updated: Dec 26, 2018
  • Author: Elizabeth A Secord, MD; Chief Editor: Michael A Kaliner, MD  more...
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IgG subclass deficiency

  • This syndrome is defined as one or more IgG subclasses at 2 standard deviations below the mean, with normal total IgG and IgM levels. IgA levels may also be low.

  • Whether this entity should be categorized under the CVID heading is controversial. By definition, 2.3% of the "normal" population fits such a classification. A few case series report these patients having recurrent sinopulmonary infections and environmental allergies.

  • No specific genetic cause is identified

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