Patients with which of the following would have a normal PT?

Question

Quizplus · Accepted Answer

Factor IX deficiency, also known as Hemophilia B or Christmas disease, primarily affects the intrinsic pathway of the coagulation cascade. Prothrombin time (PT) measures the extrinsic and common pathways, which are not directly affected by Factor IX deficiency. Therefore, patients with Factor IX deficiency would have a normal PT but an abnormal activated partial thromboplastin time (aPTT).

Patients with Which of the Following Would Have a Normal