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  1. Ataxia-Telangiectasia - GeneReviews® - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK26468
    ... of immunoglobulins, particularly selective IgA deficiency, hypogammaglobulinemia, and IgG subclass deficiency (most commonly involving IgG2 and IgG4) [ Nowak-Wegrzyn ...
  2. Primary Ciliary Dyskinesia - GeneReviews® - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK1122
    ... abnormalities: Cystic fibrosis Immunodeficiency, such as immunoglobulin G (IgG) subclass deficiency [ Zysman-Colman et al 2019 ] Allergic rhinitis Gastroesophageal ...
  3. CSF Immunoglobulin G (IgG) Index: MedlinePlus Medical Test 
    https://medlineplus.gov/lab-tests/csf-immunoglobulin-g-igg-index
    ... Medicine [Internet]. The Johns Hopkins University; c2025. Health: IgG Deficiencies; [cited 2025 Apr. 14]; [about 3 screens]. Available ... https://www.hopkinsmedicine.org/health/conditions-and-diseases/igg-deficiencies Johns Hopkins Medicine [Internet]. The Johns Hopkins University; ...
  4. Okur-Chung Neurodevelopmental Syndrome - GeneReviews® - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK581083
    ... minor infections, and a few individuals have documented IgG deficiency (hypogammaglobulinemia) and/or IgA deficiency. Genitourinary abnormalities. Pelvicaliectasia, ...
  5. 3q29 Recurrent Deletion - GeneReviews® - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK385289
    ... Immunoglobulin (Ig) deficiencies including IgA deficiency (3%) and IgG deficiency (3%) have been reported. Congenital heart defects include ...
  6. Selective deficiency of IgA 
    https://medlineplus.gov/ency/article/001476.htm
    There may be a family history of IgA deficiency. Tests that may be done include: IgG subclass measurements Quantitative immunoglobulins Serum immunoelectrophoresis
  7. Cartilage-Hair Hypoplasia – Anauxetic Dysplasia Spectrum Disorders - GeneReviews® - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK84550
    ... or severe lymphopenia. Consider IVIG if immunoglobulin or IgG subclass levels are ... Malignancy No specific recommendations for treatment of observed ...
  8. X-Linked Severe Combined Immunodeficiency - GeneReviews® - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK1410
    ... for primary immunodeficiency + = lymphocyte subclass is present; ... maintain serum IgG levels above 600 mg/dL Prompt evaluation of ...
  9. List of Excluded Studies - Safety of Vaccines Used for Routine Immunization in the United States: An Update - NCBI ... 
    https://www.ncbi.nlm.nih.gov/books/NBK572039
    ... al. Neisseria meningitidis Group A IgG1 and IgG2 subclass immune response in African children ... Model. Serum IgG & Mucosal IgA Are Important Correlates of Protection against ...