What is "factor xii"

n. coagulation factor whose deficiency results in prolongation of clotting time of venous blood [syn: Hageman factor]

Coagulation factor XII, also known as Hageman factor, is a plasma protein. It is the zymogen form of factor XIIa, an enzyme of the serine protease (or serine endopeptidase) class. In humans, factor XII is encoded by the F12 gene.