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Haemophilia B, also spelled hemophilia B, is a blood clotting disorder causing easy bruising and bleeding due to an inherited mutation of the gene for factor IX, and resulting in a deficiency of factor IX. It is less common than factor VIII deficiency (haemophilia A). [3] Haemophilia B was first recognized as a distinct disease entity in 1952. [4]
Haemophilia A affects about 1 in 5,000–10,000, while haemophilia B affects about 1 in 40,000 males at birth. [2] [5] As haemophilia A and B are both X-linked recessive disorders, females are rarely severely affected. [8] Some females with a nonfunctional gene on one of the X chromosomes may be mildly symptomatic. [8]
The presence of haemophilia B within the European royal families was well-known, with the condition once popularly known as "the royal disease". The sex-linked X chromosome bleeding disorder manifests almost exclusively in males, even though the genetic mutation causing the disorder is located on the X chromosome and can be inherited from the ...
Hemophilia is a family of rare genetic blood diseases caused by a clotting factor deficiency (FVIII in hemophilia A, FIX in hemophilia B), impacting more than 800,000 people globally.
In honor of World Hemophilia Day, Yahoo Life spoke with two hematologists about hemophilia and common myths about the rare blood-clotting disorder.
Story at a glance Hemophilia B occurs when patients lack sufficient levels of the blood protein factor IX. Some current treatments for the condition involve repeated infusions of the protein. But ...
In 1998, the NHF convened the first Women with Bleeding Disorders Task Force, to address the difficulties women had in getting proper treatment. [5] In 2008, former NHF Board Chair and health advocate Val Bias became the group's CEO. [6] In 2013, actress and comedian Alex Borstein became the NHF's spokesperson for genetic testing. [7]
The condition is of importance in the differential diagnosis to other bleeding disorders, specifically the hemophilias: hemophilia A with a deficiency in factor VIII or antihemophilic globulin, hemophilia B with a deficiency in factor IX (Christmas disease), and hemophilia C with a deficiency in factor XI. Other rare forms of bleeding disorders ...
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