A biologic false-positive rheumatoid factor (RF)assay can be manifested by patients with:

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Biologic false-positive RF results can be manifested by disorders such as SLE,Sjögren's syndrome,syphilis,and hepatitis.A low rate of positive reactions has been observed in abnormalities such as periarteritis nodosa,rheumatic fever,osteoarthritis,tuberculosis,cancer,some diseases of viral origin,osteoarthrosis,arthritis type undetermined,myositis,and polymyalgia rheumatica.Circulating RF appears to represent a phenomenon of aging independent of disease.

A Biologic False-Positive Rheumatoid Factor (RF)assay Can Be Manifested by Patients