“CO17 | Clinical Relevance of Isolated Anti-Phosphatidylserine Prothrombin Antibody Positivity: A. Hoxha1, P. Žigon2,3, L. Katja2,3, S. Čučnik2,4, Ž. Rotar2,5, S. Gavasso1, P. Zerbinati1, G. Gobbo1, P. Simioni1 | 1University of Padua, Internal Medicine Unit, Thrombotic and Hemorrhagic Centre, Department of Medicine-DIMED, Padua, Italy; 2University Medical Centre Ljubljana, Department of Rheumatology, Ljubljana, Slovenia; 3University of Primorska, Faculty of Mathematics, Natural Sciences and Information Technologies, Koper, Slovenia; 4University of Ljubljana, Faculty of Pharmacy, Ljubljana, Slovenia; 5University of Ljubljana, Faculty of Medicine, Ljubljana, Slovenia”. 2025. Bleeding, Thrombosis and Vascular Biology 4 (s1). https://doi.org/10.4081/btvb.2025.221.