high serum ige rheumatoid factor ( rf ) levels ( greater than 100 ng/ml ) were found using solid phase sandwich elisa in 11 of 20 patients with rheumatoid arthritis having significant extraarticular symptoms ( rheumatoid vasculitis ) and only in 23 of 142 usual rheumatoid patients without such symptoms ( p less than 0.01 ) .
C0003873
rheumatoid arthritis
C0240903
rheumatoid vasculitis