Rheumatoid Arthritis Quiz: What Factors Increase Risk of Developing RA?

This week's rheumatoid arthritis quiz was developed by Fotios Koumpouras, MD, Director of Education and Training and Director of the Yale Lupus Program at Yale School of Medicine.

How often is rheumatoid arthritis (RA) seronegative?

A. ~10%

B. ~50%

C. ~1%

D. ~30%