<qa>  What is a point of care, viscoelastic measurement of coagulation?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. 