Hemophilia B

How Common Is It?

Hemophilia B affects 1 in 20,000 to 34,500 males worldwide.

Other Names for Hemophilia B

Other names for hemophilia B include:
  • Christmas disease
  • Factor 9 (IX) deficiency.

Hemophilia B: Things to Remember

Key information about hemophilia B includes the following:
  • Hemophilia B is a rare, inherited bleeding disorder. Approximately 1 out of 10 people with the condition have type B.
  • Hemophilia B almost always occurs in males.
  • A baby born with this disorder has a problem with certain proteins in the blood, called factor 9 clotting factor. Clotting factors help blood clot.
  • Hemophilia can be due to a low level of clotting factors or to a clotting factor that is completely missing.
  • When clotting factors are missing, or when your body does not have enough clotting factors, it can take a long time for your blood to clot after an injury or accident. Bleeding often occurs internally.

Hemophilia Disease

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