Rheumatoid factor. Rheumatoid factor is an antibody that is measurable
in the blood. It is commonly used as a blood test for the diagnosis of rheumatoid
arthritis. Rheumatoid factor is present in about 80% of adults (but a much lower
proportion of children) with rheumatoid arthritis. It is also present in patients with
other connective tissue diseases (such as systemic lupus erythematosus) and in some with
infectious diseases (such as infectious hepatitis).
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