Previous Product Next Product Rheumatoid Factor $40.00 Helps diagnose rheumatoid arthritis and investigate symptoms related to autoimmune disorders. Rheumatoid Factor quantity Add to cart Category: Individual Testing Related products Quick View Quick View Individual TestingFibrinogen $189.00 Add to cart Quick View Quick View Individual TestingHLA-B27 Antigen $169.00 Add to cart Quick View Quick View Individual TestingC-Reactive Protein (CRP) $60.00 Add to cart