What is the purpose of rheumatoid arthritis factor test?

The rheumatoid arthritis (RA) factor test is a blood test that is used to help diagnose rheumatoid arthritis (RA), an autoimmune disorder that causes inflammation of the joints. The RA factor test measures the amount of rheumatoid factor (RF) in the blood. RF is an antibody that is produced by the immune system in response to the inflammation in the joints.

The RA factor test is not a definitive test for RA, but it can be helpful in making a diagnosis. A positive RA factor test result, along with other symptoms of RA, such as joint pain, swelling, and stiffness, can suggest that a person has RA. However, a negative RA factor test result does not rule out RA, as some people with RA do not have elevated levels of RF in their blood.

The RA factor test is also used to monitor the activity of RA. High levels of RF can indicate that the disease is active and may require treatment. Low levels of RF can suggest that the disease is inactive or well-controlled with treatment.

The RA factor test is a simple blood test that can be done in a doctor's office or laboratory. The results of the test are usually available within a few days.