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Related Experiment Videos

IgG subtype abnormalities with normal total IgG in a clinical allergy practice.

J Noyes, D Woodmansee, P Chervinsky

    Annals of Allergy
    |October 1, 1986
    PubMed
    Summary

    Immunoglobulin G subclass deficiencies are common in patients with recurrent respiratory infections, even with normal total immunoglobulin G levels. Further immune testing beyond basic immunoglobulin levels is recommended for these patients.

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    Area of Science:

    • Immunology
    • Clinical Allergy and Asthma

    Background:

    • Recurrent upper respiratory infections (URIs) can indicate underlying immune system dysfunction.
    • Normal total immunoglobulin G (IgG) levels do not exclude specific IgG subclass deficiencies.

    Purpose of the Study:

    • To investigate the prevalence of IgG subclass deficiencies in patients presenting with recurrent URIs.
    • To assess the utility of testing beyond total IgG levels in diagnosing immunodeficiencies.

    Main Methods:

    • Retrospective analysis of 75 patients with recurrent URIs treated in an allergy and asthma practice.
    • Measurement of total IgG and IgG subclass levels.
    • Assessment of antibody titers to Haemophilus influenzae type B capsular polysaccharide (HibCP) and Pneumococcal Polysaccharide (PRP) in select patients.

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    Main Results:

    • Thirty-one of 75 patients (41.3%) had IgG subclass deficiencies with normal total IgG.
    • IgG3 deficiency was most common (n=16), followed by IgG2 deficiency (n=13) and IgG1 deficiency (n=2).
    • Seven patients had low HibCP titers, and two had decreased PRP titers, suggesting functional antibody deficiency.

    Conclusions:

    • IgG subclass deficiencies are frequently observed in patients with recurrent URIs.
    • Evaluation for IgG subclass deficiencies and functional antibody responses is crucial in patients with recurrent infections, even with normal total IgG levels.
    • Standard immunoglobulin testing may not fully identify all patients with underlying immunodeficiencies contributing to recurrent infections.