Which laboratory blood test result for a patient taking clarithromycin (Biaxin) and warfarin (Coumadin) does the nurse report immediately to the prescriber?
a. Potassium 3.6 mEq/L
b. Sodium 134 mEq/L
c. Blood urea nitrogen (BUN) 21 mg/dL
d. International normalized ratio (INR) 4.6
D
Clarithromycin is a macrolide and can interfere with metabolism of many drugs. In particular, they increase the effects of warfarin. This patient's INR of 4.6 indicates a dangerously long clot-ting time and a greatly increased risk for bleeding.
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