NHA Certified Clinical Medical Assistant (CCMA)Foundational Knowledge and Basic ScienceMedium
A medical assistant is reviewing a patient's medication list and notes that the patient is taking warfarin. Which of the following laboratory tests is most likely to be ordered regularly to monitor the effectiveness and safety of this medication?
- AComplete Blood Count (CBC)
- BBasic Metabolic Panel (BMP)
- CLiver Function Tests (LFTs)
- DProthrombin Time (PT/INR)
Show answer & explanationAnswer & explanation
Correct answer: D. Prothrombin Time (PT/INR)
Warfarin is an anticoagulant that works by interfering with the body's clotting cascade. Regular monitoring of PT/INR is crucial to ensure the medication is within a therapeutic range, preventing both excessive bleeding and clot formation.
Why the other options are wrong
- A. A CBC evaluates blood components but is not the primary test for warfarin monitoring.
- B. A BMP assesses kidney function, electrolytes, and glucose, which is not the primary indicator for warfarin.
- C. LFTs assess liver health, but are not the primary monitoring test for warfarin's anticoagulant effect.
Warfarin Monitoring
Warfarin is an anticoagulant medication requiring regular laboratory monitoring to ensure therapeutic effectiveness and patient safety.
- Prevents blood clots
- Interferes with Vitamin K-dependent clotting factors
- Requires frequent dosage adjustments based on lab results
Memory trick: Warfarin watches the clock: PT/INR time.