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Allergy / Immunology

Immunoglobulin M (IgM)

Also known as: IgM

CPT 82105Quest 1759LabCorp 006249
When to Seek Prompt Care

Unexplained recurrent infections, multiple infections, or opportunistic infections, with or without chronic diarrhea, may indicate a need to contact a clinician.

What It Measures

This test checks how much Immunoglobulin M (IgM) is in your blood. IgM is a type of protein. Your body makes these proteins to fight new infections.

Why It's Ordered

Doctors often order this test to check how well your body's defense system is working. They might do this if you get sick often. They also use it to check problems that change the levels of your protective proteins.

Reference Range

Reference ranges for IgM can vary by laboratory, and interpretation may depend on factors like age, sex, pregnancy status, specimen type, and clinical context.

Clinical Reference

Quest: 1759
LabCorp: 006249
CPT: 82105
ICD-10: C22.0, C22.9, Z12.89, B18.2

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Educational purposes only — This information is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your lab results with your healthcare provider.