Trick of the Trade: Warfarin tablet strength identification

Medical providers commonly encounter patients in the emergency department who state they are anticoagulated with warfarin, but they have no idea what dose they are taking. “I know that I take two pills of warfarin daily.” Dosing becomes critically important especially when continuing their medication as an inpatient, refilling their medications, or adjusting their outpatient dose because of an inappropriately high or low INR level. How can you determine the patient’s warfarin dose?
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