To ensure compliance with regulations, a licensed "medical examiner" listed on the Federal Motor Carrier Safety Administration (FMCSA) National Registry must conduct a Department of Transportation (DOT) physical examination. This examination remains valid for a maximum of 24 months. In certain cases, the medical examiner may issue a certificate for a duration shorter than 24 months to monitor specific conditions. As a commercial motor vehicle (CMV) driver, your responsibility for safety is paramount. Every time you start your vehicle, you not only safeguard your own well-being but also that of fellow road users. The physical examination, required for your medical certificate, confirms your fitness to perform the demanding duties of a CMV driver and uphold the safety of our nation's roads. As part of the examination, you will be requested to provide a urine sample, which aids in screening your kidneys for potential medical concerns.