A rheumatoid factor (RF) test detects rheumatoid factor, a type of antibody (proteins that fight off harmful substances) in your blood. RF antibodies sometimes attack healthy cells and tissues, ...

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 ...

More than 18 million people worldwide suffer from rheumatoid arthritis, including nearly 1.5 million Americans.

Obesity may affect the blood tests used to diagnose and monitor rheumatoid arthritis in women, according to a study published in Arthritis Care & Research. Blood tests that help determine rheumatoid ...

People who develop rheumatoid arthritis experience changes to their immune systems long before their joints become swollen and painful, suggesting that early treatment might stop or limit damage, a ...