eMedicine Specialties > Allergy and Immunology > Immunodeficiencies
Immunoglobulin M Deficiency: Differential Diagnoses & Workup
Updated: Jul 21, 2009
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
Differential Diagnoses
DiGeorge Syndrome
Hypocomplementemia
Hypogammaglobulinemia
Immunoglobulin A Deficiency
Immunoglobulin G Deficiency
Wiskott-Aldrich Syndrome
Other Problems to Be Considered
Common variable immunodeficiency
Defects in B lymphocytes and T lymphocytes
Wiskott-Aldrich syndrome (WAS) also presents with low levels of IgM, but levels of IgA and IgE are often elevated. WAS is an X-linked disorder manifesting in infancy with eczema, thrombocytopenia, and recurrent pyogenic infections.
Workup
Laboratory Studies
- Quantitative levels of IgM, IgG, IgA, and IgE, along with IgG subclasses, are measured. This is done to exclude more common immunodeficiency disorders, such as common variable immunodeficiency and IgA deficiency. Particularly in adults, serum immunoelectrophoresis should be done to rule out the possibility of a concomitant clonal B-cell disorder such as multiple myeloma or chronic lymphocytic leukemia.
- The biological significance of a seemingly isolated low IgM level may be assessed by immunizing the patient with protein (eg, tetanus) and polysaccharide (eg, unconjugated Streptococcus pneumoniae) vaccines and assessing whether antigen-specific IgG responses are normal.
Imaging Studies
- Imaging studies are not required routinely for SIgM deficiency. However, if patients report a history of recurrent sinopulmonary infection, CT scans of the sinuses and chest may be helpful for diagnosing chronic sinusitis and bronchiectasis, respectively.
Other Tests
- Flow cytometry for B cells with surface IgM may be helpful.
- Other tests are not required routinely for SIgM deficiency. However, other tests may be needed for further evaluation of associated diseases.
Procedures
- Diagnostic procedures are not routinely required for SIgM deficiency. They may be needed for diagnosis of infections, complications, or associated diseases.
More on Immunoglobulin M Deficiency |
| Overview: Immunoglobulin M Deficiency |
Differential Diagnoses & Workup: Immunoglobulin M Deficiency |
| Treatment & Medication: Immunoglobulin M Deficiency |
| Follow-up: Immunoglobulin M Deficiency |
| References |
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References
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Further Reading
Keywords
immunoglobulin M deficiency, IgM deficient, selective IgM deficiency, SIgMD, hypogammaglobulinemia, IgM, IgM deficiency, DiGeorge syndrome, hypocomplementemia, hypogammaglobulinemia, IgA deficiency, IgG deficiency, Wiskott-Aldich syndrome, IgG reference range, Ig reference ranges, common variable immunodeficiency
Differential Diagnoses & Workup: Immunoglobulin M Deficiency