IgM (Immunoglobulin M)

This laboratory investigation evaluates IgM (Immunoglobulin M) in a blood specimen, helping clinicians assess the presence or level of a specific antibody or immune marker. The finding may contribute to evaluation of previous exposure, immune response, or a suspected condition, depending on the marker tested. A positive or negative result does not always establish or exclude active disease; timing, symptoms, vaccination history, and other tests may matter. The clinician should interpret the result in context.