Testing for factor X deficiency

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A healthcare provider may suspect a bleeding disorder like factor X deficiency based on:

  • A personal history of bleeding symptoms
  • A family history of a bleeding disorder

When factor X deficiency is suspected, the diagnosis is made through blood tests that measure the time it takes for blood to clot. These include1,2:

  • Prothrombin time (PT)
  • Partial thromboplastin time (PTT)
  • Thrombin time

A blood test called a factor X assay may be used to confirm the diagnosis.1 This is a factor X-specific test that measures the activity of factor X in the blood.3

  1. National Hemophilia Foundation. Factor X. https://​www.hemophilia.org/​Bleeding-Disorders/​Types-of-Bleeding-Disorders/​Other-Factor-Deficiencies/​Factor-X. Accessed January 6, 2015.
  2. MedlinePlus Medical Encyclopedia. Factor X deficiency. http://​www.nlm.nih.gov/​medlineplus/​ency/​article/​000553.htm. Accessed January 6, 2015.
  3. MedlinePlus Medical Encyclopedia. Factor X assay. http://​www.nlm.nih.gov/​medlineplus/​ency/​article/​003680.htm. Accessed January 6, 2015.