You can obtain a USDOT Medical Examiner's Certificate by receiving a USDOT physical performed by a medical examiner. Be sure to choose a medical examiner that is listed on the Federal Motor Carrier Safety Administration's FMCSA National Registry.
How do I know if the Medical Certificate is on my record or not?
You can monitor your CLP/CDL medical certification status by subscribing to text and email notifications online at MyDMV.