BTG3 and rheumatoid arthritis: In our study, where the screening ANA test was performed at a serum dilution of 1/160, approximately 27% of patients referred because of a positive ANA/ant-ENA antibody test had an AARD, approximately 10% had equivocal evidence for AARD, and the remainder had a wide variety of rheumatic (i.e. rheumatoid arthritis) and non-rheumatic conditions.