What if your immunoglobulin m is elevated? Does it mean an infection?

Depends. Igm & ige are the first antibodies to rise in the face of infection. As the body refines its immune response IgA & igg antibodies specific for the infecting agent are produced while specific IgM levels fall. Rarely does the IgM response to an infection raise the total amount of igm. Exceptions are congenital infections. High total IgM in adults suggest autoimmune disease or malignancy.