factor VII n.
A factor in the clotting of blood that forms a complex with tissue thromboplastin and calcium to activate the prothrombinase, thus acting to accelerate the conversion of prothrombin to thrombin. Also called convertin, cothromboplastin, proconvertin, serum accelerator, serum accelerator globulin, serum prothrombin conversion accelerator.
- Factor VIII
noun 1. . noun 1. a protein that participates in the clotting of blood. It is extracted from donated serum and used in the treatment of the commonest type of haemophilia, in which it is absent factor VIII n. A factor in the clotting of blood, a deficiency of which is associated with hemophilia A. […]
- Factor x
factor X n. See prothrombinase.
- Factor xii
factor XII n. A factor in the clotting of blood, a deficiency of which results in prolonged clotting time for venous blood. Also called Hageman factor.
- Factor xiii
factor XIII n. A factor in the clotting of blood that is converted by thrombin into its active form, which cross-links subunits of the fibrin clot to form insoluble fibrin. Also called Laki-Lorand factor.