When should Factor IX be administered to a patient?

Factor IX is specifically indicated for the treatment of patients with hemophilia B, which is also known as Christmas disease. Hemophilia B is caused by a deficiency in Factor IX, leading to problems with blood clotting and resulting in prolonged bleeding episodes. Therefore, administering Factor IX provides the necessary replacement therapy to help manage these bleeding episodes effectively.

The other options do not correctly align with the specific use of Factor IX. Hemophilia A is caused by a deficiency in Factor VIII, and thus patients with this condition would require Factor VIII replacement therapy rather than Factor IX. Factor IX is not indicated for all patients with bleeding disorders, as different bleeding disorders depend on specific factor deficiencies. Additionally, while Factor IX may be administered during surgical procedures for patients with hemophilia B to prevent excessive bleeding, it is not limited to surgical use; it can also be used during regular bleeding episodes in these patients. This makes the targeted use of Factor IX treatment crucial for those with hemophilia B to manage their condition effectively.