If you have hemophilia B (also called Christmas Disease), you are missing or have a deficiency (lower level) of clotting factor IX (FIX). This means your blood cannot successfully form a clot. Hemophilia B is very rare—out of the 30,000 Americans who have hemophilia, only about 7,000 have hemophilia B. Hemophilia B is hereditary. Because it is an X chromosome-linked condition, males are more typically affected and therefore more frequently diagnosed. Hemophilia B affects one in 500 male births in the U.S., and approximately 100 babies are born with hemophilia B each year. Approximately 1.1 million people worldwide are living with hemophilia. All races and economic groups are affected equally. Most people with hemophilia B who have access to factor replacement therapy have a normal life expectancy and are able to lead a fairly normal life.
If you have hemophilia B, you should have regular checkups with a hematologist or visit an HTC annually. If you or someone in your family experiences hemophilia B symptoms, and you have not yet been diagnosed, you should contact your medical provider for a referral to a hematologist or HTC for testing and diagnosis.