If a patient's APTT is prolonged, and their PT is normal, this could be due to all of these conditions except:

Question

Quizplus · Accepted Answer

Vitamin K deficiency typically affects the production of Vitamin K dependent clotting factors (II, VII, IX, and X), leading to prolonged PT (Prothrombin Time) rather than APTT (Activated Partial Thromboplastin Time) alone. Conditions like Hemophilia A, Lupus anticoagulant, Factor XI deficiency, and the presence of Heparin affect pathways measured by APTT without necessarily altering PT.

If a Patient's APTT Is Prolonged, and Their PT Is