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Hemophilia B

A deficiency of blood coagulation factor IX inherited as an X-linked disorder. (Also known as Christmas Disease, after the first patient studied in detail, not the holy day.) Historical and clinical features resemble those in classic hemophilia (HEMOPHILIA A), but patients present with fewer symptoms. Severity of bleeding is usually similar in members of a single family. Many patients are asymptomatic until the hemostatic system is stressed by surgery or trauma. Treatment is similar to that for hemophilia A. (From Cecil Textbook of Medicine, 19th ed, p1008)

Year introduced: 1999(1966)

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Tree Number(s): C15.378.100.100.510, C15.378.100.141.510, C15.378.463.510, C16.320.099.510, C16.320.322.235

MeSH Unique ID: D002836

Entry Terms:

  • Bs, Hemophilia
  • Hemophilia Bs
  • Deficiency, Factor IX
  • Deficiencies, Factor IX
  • Factor IX Deficiencies
  • Factor IX Deficiency
  • Hemophilia B Leyden
  • Hemophilia B(M)
  • Hemophilia Bs (M)
  • Plasma Thromboplastin Component Deficiency
  • F9 Deficiency
  • Deficiencies, F9
  • Deficiency, F9
  • F9 Deficiencies
  • Christmas Disease
  • Disease, Christmas
  • Haemophilia B
  • Haemophilia Bs

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