Which of the following is one for a patient on coumarin (warfarin) therapy_______________?
Correct answer: B. Prothrombin time (PT)
- A. Partial thromboplastin time ( PTT)
- B. Prothrombin time (PT)
- C. Bleeding time (BT)
- D. Capillary fragility test (CFT)
Explanation
Warfarin reduces vitamin-K-dependent clotting factors, particularly affecting the extrinsic pathway, so its effect is monitored with prothrombin time, usually reported as INR. PTT is mainly used to monitor unfractionated heparin.
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