... Blood tests are required with Warfarin, but not with Xeralto and other drugs like Xeralto. Too much Warfarin and you bleed too easily. Too little and you run the risk of your blood clotting. It’s kind of common sense you can have too much or too little of Xeralto as well with similar consequences. Why are blood tests not required with Xeralto? I have yet to hear an answer that makes any sense