Stuart–Prower factor (Factor X)

Return to Cardiovascular System Menu

Factor X, also known as Stuart-Prower factor, is a clotting protein that helps blood clot to stop bleeding. It's a serine protease produced in the liver that's dependent on vitamin K. Factor X is the first enzyme in the process of thrombus formation.

Factor X deficiency is a rare bleeding disorder that can be inherited or acquired. It's caused by a lack of factor X in the blood. The severity of the disorder varies from person to person.

Factor X deficiency was first identified in the 1950s in two patients, Rufus Stuart and Audrey Prower.