If time permits, advancing the case to get back INR results will guide you on timing of heparin discontinuation. This alone should not cost you lot of points. But this is one reason why it is better to choose "Rivaroxaban" rather than warfarin in managing DVT/ PE cases on exam. UWorld has not updated their software but exam software has Rivaroxaban as an option to Rx VTE. Choosing this reduces the burden of INR monitoring, heparin bridge and navigating the clock and will obviously get you good score.
I'm currently doing the Uworld CCS cases and I've just come across two cases in which DVT/PE is treated with warfarin and heparin bridging. Now where I practice, uncomplicated DVT/PE is just treated with apixaban/rivaroxaban/whichever right off the bat, sometimes with prior LMWH/UFH if there is...
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Best wishes!