“CO37 | Assessment of clotting factor activity and sterility in thawed fresh frozen plasma supplied to helicopter emergency medical services for prehospital transfusion: D. Romeo1, M. Marchetti1,2, M. Testa1, A. Motta1, P. Gomez-Rosas1, G. Ravasio1, F. Daminelli3, L. Barcella1, A. Falanga1,2 | 1Immunohematology and Transfusion Medicine Department, Hospital Papa Giovanni XXIII, Bergamo; 2School of Medicine and Surgery, University Milano Bicocca, Milan; 3Anesthesia and Resuscitation Department, Hospital Papa Giovanni XXIII, Bergamo, Italy” (2025) Bleeding, Thrombosis and Vascular Biology, 4(s1). doi:10.4081/btvb.2025.244.