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)

Descriptor ID	D002836
MeSH Number(s)	C15.378.100.100.510 C15.378.100.141.510 C15.378.463.510 C16.320.099.510 C16.320.322.235
Concept/Terms	Hemophilia B Hemophilia B 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

Below are MeSH descriptors whose meaning is more general than "Hemophilia B".

Below are MeSH descriptors whose meaning is related to "Hemophilia B".

Below are MeSH descriptors whose meaning is more specific than "Hemophilia B".