An older patient takes warfarin (Coumadin).The patient's international normalized ratio (INR)is 1.0.What action by the nurse is best?

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The therapeutic INR is 2-3 (2-3.5 in some sources),so this level is not therapeutic.Foods rich in vitamin K antagonize warfarin.Before consulting the provider about adjusting the dose,the nurse should first assess the patient's diet history to see if too many vitamin K-rich foods are being eaten.The dose may need adjustment.Vitamin K would be given for an overdose.

An Older Patient Takes Warfarin (Coumadin)