• IgG: 560 to 1800 mg/dL
• IgM: 45 to 250 mg/dL
• IgA: 100 to 400 mg/dL

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

Increased levels of IgG may indicate the following:

• Chronic infection or inflammation
• Hyperimmunization
• IgG multiple myeloma
• Liver disease
• Rheumatic fever
• Rheumatoid arthritis

Decreased levels of IgG may indicate the following:

• Agammaglobulinemia (very rare)
• Amyloidosis
• Leukemia
• Myeloma
• Preeclampsia

Increased levels of IgM may indicate the following:

• Early HIV infection
• Infectious mononucleosis
• Lymphoma
• Macroglobulinemia
• Myeloma
• Rheumatoid arthritis

Decreased levels of IgM may indicate the following:

• Agammaglobulinemia (very rare)
• Amyloidosis
• Leukemia
• Myeloma

Increased levels of IgA may indicate the following:

• Chronic infections, especially involving the gastrointestinal tract
• Inflammatory bowel disease
• Myeloma
• Rheumatic fever

Decreased levels of IgA may indicate the following:

• Agammaglobulinemia (very rare)
• Hereditary IgA deficiency
• Myeloma
• Protein-losing gastroenteropathy