During a DOT physical, the assessor examines your physical and mental health to ensure no pre-existing medical conditions will interrupt your ability to operate a vehicle safely. The examiner performs a series of tests to check your mental health, vision, hearing, blood pressure, and digestive health. You will also undergo urinalysis for diabetes and drug testing. A DOT physical examination generally takes between 30 minutes and one hour to complete. Drivers with existing medical conditions are reminded to bring any appropriate related documents with them to the appointment.