Factor VII. Blood Coagulation Factor VII . Factor 7 . Factor Seven . Factor VII, Coagulation . Proconvertin . Stable Factor . Coagulation Factor VII . Heat- and storage-stable plasma protein that is activated by tissue thromboplastin to form factor VIIa in the extrinsic pathway of blood coagulation. The activated form then catalyzes the activation of factor X to factor Xa. . 0.59