The nurse is monitoring the laboratory test results for a client who is taking warfarin sodium after mechanical heart valve replacement. The nurse should expect the international normalized ratio (INR) for this client to be at what value in order to be therapeutic?
1. 0.2
2. 0.5
3. 1.0
4. 3.0
Answer: 4. 3.0
Explanation: The normal value for INR is 0.81 to 1.2 (0.81 to 1.2). The target INR or therapeutic level for a client receiving warfarin sodium is 2.5 to 3.5 (2.5 to 3.5).
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