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Immunoglobulin M

IgM Serum IgM
Serum (SST) g/L

About this test

First immunoglobulin produced in primary immune response. Pentameric structure. Elevated in Waldenström's macroglobulinaemia.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 0.5 – 3 Adult

Clinical Interpretation

Low / Decreased
Low IgM — Bruton's agammaglobulinaemia, secondary immunodeficiency.
High / Increased
Elevated — Waldenström's macroglobulinaemia, primary infection (IgM response), some autoimmune conditions, chronic liver disease.
Specimen
Serum (SST)
Reporting Unit
g/L
Category
🛡️ Immunology

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.