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. Author manuscript; available in PMC: 2011 Feb 1.
Published in final edited form as: J Allergy Clin Immunol. 2010 Jan 12;125(2 Suppl 2):S238–S247. doi: 10.1016/j.jaci.2009.09.041

Table 3.

Differential diagnosis for immunoglobulin levels

Immunoglobulin Increased Decreased
Ig G Infection, inflammation, hyperimmunization, IgG multiple myeloma, liver disease, rheumatic fever, systemic rheumatic disease Agammaglobulinemia, amyloidosis, leukemia, myeloma, preeclampsia
IgM Early HIV infection, infectious mononucleosis, lymphoma, macroglobulinemia, myeloma, rheumatoid arthritis Rarely agammaglobulinemai, amyloidosis, leukemia, myeloma
IgA Chronic infections (especially of gastrointestinal tract), inflammatory bowel disease, myeloma, rheumatic fever Agammaglobulinemia, hereditary IgA deficiency, myeloma or protein-losing enteropathy