Medically reviewed by Steffini Stalos, DOKey TakeawaysA rheumatoid factor test checks for an antibody that can be a marker for rheumatoid arthritis. It is one part of diagnosis.Not everyone with a ...

Rheumatoid factor (RF) is a type of antibody, an immune system protein that helps the body fight foreign substances like bacteria and viruses, called antigens. Antibodies, also known as ...

When persistent joint pain strikes, the search for answers often leads to a crucial diagnostic tool: the rheumatoid factor test. This relatively quick blood analysis serves as a window into the immune ...