Read common questions and answers about hemophilia: what are the types of hemophilia, what are clotting factors, hemophilia treatment options, and more.
When you have hemophilia, a clotting factor is missing from your blood. Learn how your infused factor replaces what’s missing and works with the factors naturally existing in the blood to stop a bleed.
Inhibitors are antibodies against factor that develop after receiving factor concentrate treatment. Read about risk factors for inhibitors.
Inhibitors are measured in a test called the Bethesda assay, which gives a numeric value in Bethesda units per milliliter (BU/mL).
Hemophilia B is a rare form of hemophilia caused by a deficiency of clotting factor IX; also known as Christmas disease, named after Stephen Christmas.