Predicting Spondylitis in At-Risk Relatives The risk of developing axSpA if you’re a first-degree relative (FDRs) of an AS patient has been defined by a 35 year follow-up study showing that if you are a FDR of axSpA you may be at higher risk of AAU. https://t.co/wezFZUhyZZ https://t.co/VASbJZt9UV