The invention relates to a process for identifying procoagulant platelets both in vitro and in vivo, and the identification of compounds which selectively inhibit formation of procoagulant platelets.Linvention concerne un procédé didentification de plaquettes procoagulantes in vitro et in vivo, et lidentification de composés qui inhibent sélectivement la formation de plaquettes procoagulantes.