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Factor X deficiency is a rare bleeding disorder. It is caused by having too little of a protein called factor X in the blood.1,2

  • Factor X plays an important role in blood clotting (coagulation)1
  • People with factor X deficiency have a higher risk of excess bleeding1
  • Factor X deficiency is often caused by a defect in the factor X gene that is passed down from parents to their children2

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  1. National Hemophilia Foundation. Factor X. https://​​Bleeding-Disorders/​Types-of-Bleeding-Disorders/​Other-Factor-Deficiencies/​Factor-X. Accessed January 6, 2015.
  2. MedlinePlus Medical Encyclopedia. Factor X deficiency. http://​​medlineplus/​ency/​article/​000553.htm. Accessed January 6, 2015.