Rhenis Nursing Rhenis Nursing
ATI MEDSURG FINAL EXAM
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Hint : 🔍Think about which coagulation test gauges the pathway that warfarin targets.

Correct Answers:

  • Prothrombin time (PT)


Rationale :

🩸Warfarin inhibits vitamin K–dependent clotting factors affecting the extrinsic pathway, which is monitored by PT.

🕒PT measures the time for prothrombin to convert to thrombin, directly reflecting warfarin’s anticoagulant effect.

💊Platelet count assesses number of platelets but does not evaluate clotting factor activity.

✨Activated partial thromboplastin time (aPTT) evaluates the intrinsic pathway and is used to monitor heparin, not warfarin.

📌Core Message

Monitor warfarin therapy by measuring PT, as it reflects changes in vitamin K–dependent clotting factors.

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