A rheumatoid factor test measures the amount of rheumatoid factor in your blood. High levels of rheumatoid factor in the blood are most often associated with autoimmune diseases, such as rheumatoid arthritis and Sjogren’s syndrome.
Doctors order a blood test to check for the presence of RF if they suspect you have an autoimmune condition, such as rheumatoid arthritis or Sjögren syndrome.
RFs are used as a marker in individuals with suspected rheumatoid arthritis (RA) or other autoimmune conditions. The normal reference range for RF is less than 15 IU/mL or less than 1:16.
