Which of the following laboratory tests is most commonly used to monitor the therapeutic effect of Warfarin?
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Correct answer: Prothrombin Time (PT) / INR
Warfarin inhibits the synthesis of Vitamin K-dependent factors (II, VII, IX, X). Since Factor VII has the shortest half-life and is part of the extrinsic pathway, the PT/INR is the most sensitive and standardized test for monitoring.
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