Stabilized liquid formulation, useful as a pharmaceutical composition or diagnostic reagent, comprises blood coagulation Factor VII activating protease and an aminoacid or derivative, e.g. ornithine or creatine, as stabilizer

liquid preparation stabilized activating protease factor VII of blood coagulation or its proenzyme, characterized in that a) contains one or more compounds selected from ornithine group, diaminopimelic acid, agmatine, creatine, guanidinacético acid, acetylornithine, citrulline, argininosuccinic acid, tranexamic acid and epsilon-aminocaproic acid or its salts and derivatives b) exhibits a pH value between 2.0 and 8.0.