rheumatoid factor(redirected from rheumatoid factors)
Also found in: Thesaurus, Medical, Encyclopedia.
Related to rheumatoid factors: RF test
Any of several immunoglobulins that are found in the blood serum of many individuals with rheumatoid arthritis and in some individuals with other inflammatory diseases. A test for one or more of these factors is used in diagnosing rheumatoid arthritis.
an antibody that is found in the blood of many persons afflicted with rheumatoid arthritis and that reacts against globulins in the blood.