Study of 1272 RA pts, 69.5% were seropositive. Seropositive RA patients had two-fold increased risk for abnormalities on PFTs (ORs ranging from 2.48 RLD, 3.12 COPD & 2.30 DLCO abnl; associations were stronger for RF+ than for CCP+. https://t.co/RQ5GgoGqwA