system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Rheumatoid factor in rheumatoid ahritis is impoant because:
assistant
The correct answer is  Answer is A (R. A. factor is associated with bad prognosis) : Rheumatoid factor is only of prognostic significance because patients with high titres tend to have more severe and progressive disease with extraaicular manifestations Rheumatoid factors are autoantibodies of IgMQ type that react with FC poion of IgGQ The presence of RA factor is not specific for R.A. The presence of Rheumatoid factor does not establish the diagnosis of RA