Reviewed: 13. Juli 2026
IgM Immunoglobulin M (IgM)
Unit: g/l
Quick Explanation
IgM is the first antibody class formed with a new infection, and therefore usually indicates an acute or recently occurred infection. The value is often assessed together with IgG to distinguish acute from past infections.
📊 Reference Values
ℹ️ Reference ranges may vary slightly between laboratories. Always compare your value with the reference range from your own lab report.
🔍 Possible Causes
Value too high — possible causes
- ·Acute infection
- ·Certain autoimmune diseases
- ·Certain blood disorders (e.g. Waldenström's macroglobulinemia)
Value too low — possible causes
- ·Congenital or acquired immune deficiency
This list shows possible causes — not a diagnosis. Only your doctor can correctly interpret your result.
🩺 Questions for Your Doctor
- →Does my IgM value indicate an acute infection?
- →Should IgG also be measured?
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Medical Disclaimer
The content on this page is for general information only and does not replace professional medical advice, diagnosis, or treatment. Always consult your doctor or pharmacist for health-related questions. Lab values should always be assessed in the context of your personal medical history.