Immunoglobulin A, Quantitative

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Immunoglobulin A, Quantitative
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Overview
Increased monoclonal IgA may be produced in lymphoproliferative disorders, especially multiple myeloma and “Mediterranean” lymphoma involving bowel. An IgA monoclonal peak >2 g/dL is a major criterion for myeloma. It may be elevated in a wide range of conditions affecting mucosal surfaces, where IgA is largely produced. Some clinically significant IgA deficiencies have concomitant deficiencies of IgG2 and IgG4. IgA may be decreased in patients with chronic sinopulmonary disease, in ataxia-telangiectasia, or congenitally. Patients with congenital IgA deficiency are prone to autoimmune diseases, and may develop antibody to IgA and anaphylaxis if transfused. IgA levels may rise with exercise and fall during pregnancy.

Increased monoclonal IgA may be produced in lymphoproliferative disorders, especially multiple myeloma and “Mediterranean” lymphoma involving bowel. An IgA monoclonal peak >2 g/dL is a major criterion for myeloma. It may be elevated in a wide range of conditions affecting mucosal surfaces, where IgA is largely produced. Some clinically significant IgA deficiencies have concomitant deficiencies of IgG2 and IgG4. IgA may be decreased in patients with chronic sinopulmonary disease, in ataxia-telangiectasia, or congenitally. Patients with congenital IgA deficiency are prone to autoimmune diseases, and may develop antibody to IgA and anaphylaxis if transfused. IgA levels may rise with exercise and fall during pregnancy.

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