Canadian Pharmacist Qualifying Exam Practice · Question
The primary lab parameter monitored for warfarin therapy is:
Warfarin is monitored by INR (target usually 2.0–3.0; 2.5–3.5 for mechanical mitral valves). aPTT is for heparin.
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Question: The primary lab parameter monitored for warfarin therapy is:
Answer options:
- aPTT ✅ INR
- Platelets
- ALT
Correct answer: INR
Explanation: Warfarin is monitored by INR (target usually 2.0–3.0; 2.5–3.5 for mechanical mitral valves). aPTT is for heparin.
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