2025. PO57 | Direct oral anticoagulant determination in urine samples compared to plasma concentrations in outpatients with atrial fibrillation and obesity: A. Pannunzio1, I.M. Palumbo1, D. Menichelli1, V. Cammisotto2, V. Castellani3, E. Baldacci4, R. Mormile4, A. Chistolini4, G. Bernardini5, N. Porcu1, D. Pastori2, J. Harenberg6, F. Violi2, P. Pignatelli2 | 1Department of General Surgery, Surgical Specialties and Organ Transplantation Paride Stefanini, Sapienza University of Roma, Italy; 2Department of Clinical Internal, Anesthesiological and Cardiovascular Sciences, Sapienza University of Roma, Italy; 3Department of Translational and Precision Medicine, Sapienza University of Roma, Italy; 4Department of Hematology, Oncology and Dermatology, Sapienza University of Roma, Italy; 5U.O.S.D. Medicina Rigenerativa DAI, Medicina Diagnostica e Radiologia, Policlinico Umberto 1, Roma, Italy; 6Ruprecht Karls University of Heidelberg, Germany. Bleeding, Thrombosis and Vascular Biology. 4, s1 (Aug. 2025). DOI:https://doi.org/10.4081/btvb.2025.326.