The invesigators seek to devise a strategy for the assessment of Rivaroxaban activity in
trauma and Emergency General Surgery (EGS) patients available as point-of-care testing.
Thromboelastography (TEG) is a point of care, viscoelastic measurement of coagulation that is
widely used in trauma and is viewed by many as superior to standard coagulation studies for
the assessment of coagulopathy following injury and may be useful in detecting rivaroxaban
effect in trauma and EGS patients to assess the degree of functional factor Xa impairment.