Low Immunoglobulin M (IgM): what it means
A Immunoglobulin M (IgM) result below the normal range is considered low. Here is what a reduced Immunoglobulin M (IgM) can point to, and when it is worth discussing with a doctor.
Reference range: ~0.4–2.3 g/L in adults; the first antibody made in a new infection, so a raised IgM points to a recent or acute infection
Understand your full resultWhat a low Immunoglobulin M (IgM) can mean
- Antibody (immune) deficiency — can be part of a broader immune deficiency.
- Protein loss or some medications and blood conditions.
When to discuss with a doctor
A raised total IgM is most often explained by a recent or ongoing infection and is interpreted with the clinical picture. Where a specific infection is in question, a targeted IgM antibody test (positive suggesting recent infection) is the relevant test. A persistent, marked monoclonal IgM should prompt specialist assessment for a blood condition, and a low IgM as part of recurrent infections warrants immune evaluation. IgM is read together with IgG and IgA. Mediora.AI shows IgM alongside the other immunoglobulins so the pattern — acute versus long-term — is visible; the interpretation belongs with your doctor.
Conditions this can relate to
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Upload your test - freeMediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.