“PO18 | Does muscle mass matter? Appendicular lean mass as a determinant of anti-XA activity in elderly patientes: B.M. Zanforlini1, V. Bernardi1, E. Campello2, E.M. Bicego1, C. Curreri1, A. Vaticano1, C. Sartori1, L. Manfron1, A. Perencin1, P. Rollo1, A. Baruffol1, L. Ruoso1, C. Simion2, C. Bulato2, P. Berto2, P. Simioni2, G. Sergi1 | 1Department of Medicine, Geriatrics Section, University of Padova; 2Haemorrhagic and Thrombotic Diseases Unit, Department of Medicine DIMED, Padova University Hospital, Padova, Italy” (2025) Bleeding, Thrombosis and Vascular Biology, 4(s1). doi:10.4081/btvb.2025.278.