When certifying a driver on warfarin, what additional documentation must they provide?

When certifying a driver who is taking warfarin, the requirement for additional documentation specifically includes a copy of their monthly INR results. INR, or International Normalized Ratio, is a blood test that measures how long it takes for blood to clot. For individuals on anticoagulants like warfarin, maintaining a consistent and healthy INR level is crucial, as it helps to minimize the risk of blood clots while also avoiding excessive bleeding episodes.

The monthly INR results provide essential information regarding the driver’s current blood coagulation status and help medical examiners assess if the driver is within safe therapeutic ranges, which is critical for their ability to operate a commercial vehicle safely. Monitoring INR levels is fundamental in managing the treatment and ensuring that the individual is stable enough to fulfill the demands of driving.

Additional documents such as medical history, recent echocardiogram reports, or statements from employers may provide context or further information about the driver’s health but do not specifically address the ongoing management of anticoagulation therapy or the immediate safety implications of the driver's condition as directly as the INR results do.