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Rheumatoid Arthritis (RA) Factor

This test is used in the differential detection and prognosis of arthritic disorders. Rheumatoid factors are antibodies directed against the Fc fragment of IgG. These are usually IgM antibodies, but may be IgG or IgA. Rheumatoid factor is found in the serum of a majority of individuals with rheumatoid arthritis.

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