Neck pain can be one of the effects of rheumatoid arthritis (RA). In the highest risk group (male sex, positive rheumatoid factor, longstanding and erosive joint disease), up to 80% of individuals ...
A rheumatoid factor (RF) test is a blood test that can help diagnose rheumatoid arthritis (RA). The test measures the amount of rheumatoid factor in your blood. Rheumatoid factor is an autoantibody ...