The exam checks vision, hearing, blood pressure and other conditions against federal standards. A driver who passes receives a medical examiner’s certificate, valid for up to 24 months, or less if the examiner wants to monitor a condition.
The examiner must be listed on the FMCSA National Registry of Certified Medical Examiners for the certificate to count.
Regulation: 49 CFR 391.41 to 391.45.