blood results imunglobin what does this mean on blood test
Why It Is Done. A test for immunoglobulins (antibodies) in the blood is done to: 1  Find certain autoimmune diseases or allergies. 2  Find certain types of cancer (such as multiple myeloma or macroglobulinemia). 3  See whether recurring infections are caused by a low level of immunoglobulins (especially IgG). test for immunoglobulins (antibodies) in the blood is done to: 1  Find certain autoimmune diseases or allergies. 2  Find certain types of cancer (such as multiple myeloma or macroglobulinemia).