What is hemophilia B?

Also known as: Christmas disease, factor IX deficiency, FIX deficiency, clotting factor deficiency.

Hemophilia is a disease in which the blood is missing a component that makes it clot properly. The result is that the individual with hemophilia can bleed easily, bleed excessively or not stop bleeding once they start, among other problems. In the case of hemophilia B, the blood is deficient in factor IX.


Reviewed by: Guillermo R De Angulo, MD

This page was last updated on: 1/29/2019 3:21:13 PM

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