Treatment of IgM Deficiency

Diagnosis and Clinical Presentation

• Laboratory evaluation should include measurement of immunoglobulin levels, specific antibody production, and evaluation of lymphocyte subpopulations, as recommended by the American Academy of Allergy, Asthma, and Immunology 1

Treatment Approach

Immunoglobulin Replacement Therapy

• IVIG therapy should be initiated for patients with recurrent bacterial infections, as recommended by the American Academy of Allergy, Asthma, and Immunology 1, 2
• IVIG therapy should also be considered for patients with life-threatening infections, documented bacterial infection with insufficient response to antibiotic therapy, as recommended by the European Society for Immunodeficiencies 2
• Monthly IVIG treatment should be continued until immunoglobulin levels reach adequate levels (≥400 mg/dl for IgG), with IgG trough levels monitored monthly during treatment, as recommended by the International Patient Organization for Primary Immunodeficiencies 2

Special Considerations

• Monitor frequency of infections rather than relying solely on serum immunoglobulin levels to assess treatment efficacy, as recommended by the American College of Allergy, Asthma, and Immunology 2
• For patients with milder presentations, prophylactic antibiotics can be considered as an alternative first-line treatment option, as recommended by the Infectious Diseases Society of America 2