What is the role of quantitative immunoglobulin levels in the diagnosis of bronchiectasis?

Updated: Sep 15, 2020
  • Author: Ethan E Emmons, MD; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Quantitative immunoglobulin levels, including IgG subclasses, IgM, and IgA, are useful to exclude hypogammaglobulinemia. Note, however, that on rare occasions, bronchiectasis may be seen in patients with antibody production deficiency but normal to low-normal IgG levels. In situations such as these, evaluating antibody response to Haemophilus influenzae and pneumococcal vaccines may be useful.

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