A DOT physical is the medical examination a commercial driver must pass before operating a commercial motor vehicle in interstate commerce. It is not an ordinary employment physical and it cannot be done by just any clinician: the examiner has to be listed on the Federal Motor Carrier Safety Administration's National Registry, and what comes out of it is a medical examiner certificate with an expiry date on it. For an employer, the certificate is a document you are required to hold, not a nice-to-have.
What the examination actually covers
The examiner works through a defined set of items: vision and hearing standards, blood pressure and pulse, a urinalysis that screens for underlying medical conditions rather than for drugs, and a review of the driver's own medical history. Cardiovascular, respiratory, neurological and musculoskeletal function are all assessed against the physical qualification standards the FMCSA sets, and conditions such as insulin-treated diabetes, sleep apnoea and seizure history have their own specific handling. The urinalysis is the part employers most often misunderstand: it looks for protein, blood and sugar as indicators of disease, and it is a separate thing from the regulated drug test.
Who may perform one, and why that matters
Only a medical examiner listed on the FMCSA's National Registry may perform the examination and issue the certificate. That covers doctors, physician assistants, advanced practice nurses and chiropractors who have completed the required training and testing. An examination by a clinician who is not on the registry does not produce a valid certificate, and a carrier relying on one has a driver it cannot lawfully dispatch. If you are buying occupational health services for a fleet, confirming registry listing is the first question, not a formality.
How long the certificate lasts
The maximum certification period is two years, and a great many certificates are issued for less. An examiner who wants to monitor a borderline condition, most commonly blood pressure, can certify for one year, three months or another shorter period, and drivers with certain conditions are certified for a year at most as a matter of course. That variability is the practical problem for an employer: a fleet's certificates do not all expire on a tidy annual cycle, so the expiry dates have to be tracked individually or drivers quietly fall out of qualification.
What the employer has to keep
The medical examiner certificate belongs in the driver qualification file, and for CDL holders the certification status is also reported to the state licensing agency and appears on the driving record. A carrier is expected to be able to show, for any driver on any day, that the driver was medically qualified. That is why driver qualification file management is sold as a service at all: the DOT physical is a single event, but the obligation it creates is continuous and dated.
Questions people ask about dot physical
How long is a DOT physical good for?
Two years at most. Examiners frequently certify for shorter periods when they want to monitor a condition, most often blood pressure, so one year, six months or three months are all common outcomes and the certificate itself states the period.
Does a DOT physical include a drug test?
No. The physical includes a urinalysis, but that one screens for indicators of disease such as protein and sugar. The regulated drug test required for safety-sensitive positions is a separate procedure under the Department of Transportation's own testing rules.
Who can perform a DOT physical?
Only a medical examiner listed on the FMCSA National Registry. That includes doctors, physician assistants, advanced practice nurses and chiropractors who have completed the required training. An examination by anyone else does not produce a valid certificate.
What happens if a driver fails?
The driver is not medically qualified and may not operate a commercial motor vehicle in interstate commerce. Many outcomes are temporary rather than final: a driver whose blood pressure is too high on the day is often certified for a short period or asked to return once it is controlled.