A Patient Is Stabilized on Warfarin with an International Normalized

question 16

Multiple Choice

A patient is stabilized on warfarin with an international normalized ratio (INR) of 2.7.He develops pneumonia and is admitted to the hospital.His appetite is depressed and he is placed on broad-spectrum antibiotic agents.At 1 week after the admission,his INR is 5.0.What is the most likely interpretation?

• A)The patient should be given more warfarin.
• B)A PTT should be performed to rule out heparin administration.
• C)A new sample should be collected to rule out a clotted specimen.
• D)Vitamin K is reduced, increasing the effects of warfarin.

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