What is Hemophilia B?
Hemophilia B (or Christmas disease) is less common than hemophilia A and results when the person does not have enough clotting factor IX. Although hemophilia B is usually inherited, about one third of cases are caused by a spontaneous mutation in the person’s own genes.
Hemophilia B affects about 1 in 20,000 people and is diagnosed by taking a blood sample and measuring the level of factor activity in the blood.
Hemophilia B can be mild, moderate, or severe, depending on how much clotting factor is in an affected person's blood. However, approximately two thirds of patients have moderate to severe hemophilia B. People with hemophilia B have prolonged bleeding after an injury, surgery, or tooth extraction. In severe cases, they may bleed once or twice a week and often the bleeding is spontaneous, which means it happens for no obvious reason. Serious complications can result from bleeding into the joints, muscles, brain, or other internal organs. See how bleeds, infusions and Factor IX levels may be affecting you more than you think. In mild case of hemophilia B, the disorder may remain unknown until after a surgery or serious injury.
Treatment for hemophilia B is very effective and with appropriate treatment and care, people with hemophilia B can live perfectly normal lives. The main treatment is called replacement therapy, during which clotting factor IX is infused into a vein either prophylactically (preventatively) or on-demand to prevent or treat bleeds.
Living (and Thriving) with Hemophilia B
"Don't be scared to live your life. Don't let hemophilia hold you back." These inspiring words came from college-bound hemophilia B patient Michael Joshua.Watch his story
Vita: Related Stories
The “Medical Stories” episode aired on PBS stations in 2020 and ranks as our most popular content about hemophilia B.
Find out how animal therapy works and why children who have Hemophilia B went for a swim with these friendly mammals in the F…
Resources for you
Availability of treatments may vary from country to country. Please be sure to visit your local CSLBehring.com site for further information.