Final answer:
A deficiency of factor IX results in hemophilia B, which causes impaired blood clotting and excessive bleeding.
Step-by-step explanation:
The nurse clarifies that the deficiency of factor IX results in hemophilia B, a genetic disorder that impairs the body's ability to control blood clotting. This condition leads to a tendency to bleed from even minor internal and external wounds and can cause bleeding into joint spaces after exercise, as well as into urine and stool. Hemophilia B is linked to the X chromosome and typically inherited from a healthy carrier female to her male offspring.