... warfarin arms of the SPORTIF III and SPORTIF V trials.[ 5 ] In BC we do not employ the tools needed to achieve a TTR ... The TTR c. Date of next INR test 5. The lab personnel ask four safety questions, record ... responses, and accept the warfarin dose if the INR is < 1.5 or > 4.0. 6. A warfarin-dosing calendar is printed ...