The nurse is caring for a patient who is receiving warfarin (Coumadin) and notes bruising and petechiae on the patient's extremities. The nurse will request an order for which laboratory test?
a. International normalized ratio (INR)
b. Platelet level
c. Partial thromboplastin time (PTT) and activated partial thromboplastin time (aPTT)
d. Vitamin K level
ANS: A
The INR is the test used most frequently to report prothrombin time results in patients taking warfarin. Warfarin is not an antiplatelet drug, so platelet levels are not indicated. PTT and aPTT are used to monitor heparin therapy. Vitamin K is an antidote for warfarin; levels are not routinely checked.
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