What is the difference between hemophilia a and hemophilia b?  

Hemophilias. Hemophilia is a bleeding disorder, usually inherited with an x-linked recessive inheritance pattern, which results from the deficiency of a coagulation factor. Hemophilia a results from the deficiency of clotting factor viii. Hemophilia b results from the deficiency of clotting factor ix. Acquired hemophilia is a separate noninherited condition, rarer than congenital hemophilia, autoimmune.
Bleeding disorder. Hemophilia a is due to the absence of clotting factor viii (most common) hemophilia b is due to the absence of clotting factor ix (less common).

Related Questions

What's the difference between somebody with hemophilia a and someone with hemophilia b?

Different factors. The difference is in the clotting factor missing. Hemophilia a is caused by lack of the blood clotting factor viii. Hemophilia b is caused by a lack of blood clotting factor ix. They both lead to the inability of blood to clot properly, just in different ways. Read more...
Deficiency factor 8. The difference is that hemophilia a is due to a deficiency of factor 8 (viii), while hemophilia b is from a deficiency of factor 9 (ix). Both are sex-linked recessive, and both have similar lab findings of a normal pt and high ptt. The treatment of each is replacement of the respective factors. Hemopnilia a gets factor 8 while hemophilia b get factor 9 in concentrates or fresh frozen plasma. Read more...