Women with rheumatoid arthritis (RA) are less likely to have a live birth following assisted reproduction technology (ART) treatment than women without RA (adjusted OR 0.78; 95% CI 0.65–0.92) according to a nationwide study that analysed data from the Danish ART registry (1,149 and 198,941 embryo transfers in women with and without RA, respectively). Women with RA had a reduced chance of a biochemical pregnancy and a clinical pregnancy after embryo transfer, suggesting a reduced likelihood of embryo implantation.