Imagine it's your first week of an APPE rotation at an anticoagulation clinic. You're excited and a little nervous. You've been brushing up on your Lovenox. You've read all you can about Eliquis and Xarelto and Pradaxa (oh my!). You're ready to impress.

Then there's the elephant in the room that is warfarin. Sure, you know lots about it. You can rattle off facts about VKORC1, and R and S enantiomers. You know that the pills are color coded by strength. 

But how do you actually dose warfarin? If you're like most of us, you probably don't feel adequately prepared to jump right into managing wafarin therapy with what you learned in the classroom.