Prothrombin time is useful for_______________?
Correct answer: B. For evaluation in a patient taking anticoagulant drugs
- A. Detection of clot retraction
- B. For evaluation in a patient taking anticoagulant drugs
- C. In hemophilia
- D. Platelet count
Explanation
Prothrombin time assesses the extrinsic and common coagulation pathways and is routinely used to monitor warfarin and other vitamin K antagonist therapy. It is not a platelet count or a test for clot retraction.
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