These are proteins in the body that have antibody activity. Many conditions can cause you to have too much of these proteins. These include:
A lack of these proteins may be caused by many conditions. These include cancers, medicines, and chronic diseases.
Used to help classify arthritis and diagnose rheumatoid arthritis. Other tests are often used as well to group and determine types of arthritis.
HLA (human leukocyte antigens) typing
Tested to check compatibility in organ, tissue, and bone marrow transplantation. Also tested to confirm paternity. And to diagnose HLA-linked disorders such as some autoimmune conditions.