What the examiner actually checks
The DOT physical is a fitness-for-duty exam, not a full annual checkup. The examiner tests your vision (at least 20/40 in each eye, with or without correction), your hearing (a forced whisper from five feet), your blood pressure and pulse, and takes a urine sample to screen for protein and glucose, which can flag undiagnosed diabetes or kidney issues.
You will also review your medical history in detail: heart conditions, diabetes, sleep apnea, seizures, medications, and prior surgeries. Answer honestly. Examiners verify against the National Registry system, and getting caught hiding a condition creates far bigger problems than the condition itself.
What to bring to your appointment
Bring your driver license, your glasses or hearing aids if you use them, and a complete list of your medications with doses. If you manage a condition like diabetes, hypertension, or sleep apnea, bring recent records or a note from your treating doctor showing it is under control.
If you use a CPAP machine, bring compliance data showing regular use. Drivers with well-managed conditions pass every day. What causes trouble is showing up without documentation and hoping for the best. A little preparation turns a stressful exam into a routine one.
How long the medical card lasts
A clean bill of health usually earns you a card good for the full 24 months. Certain conditions shorten that: hypertension and diabetes often result in a 12-month card, and some conditions require annual or even more frequent monitoring. The examiner makes the call based on federal standards, not personal opinion.
Mark your expiration date the day you get the card. Texas can downgrade your CDL if your medical certification lapses, which means reapplying and retesting headaches. Set a reminder at least a month before expiration so a scheduling delay never puts your license at risk.
Where to get a DOT physical in San Antonio
Federal rules require your examiner to be listed on the FMCSA National Registry of Certified Medical Examiners. Any clinic advertising DOT physicals should confirm this when you call; if they cannot, go elsewhere.
As a local reference point, CDL Doc in San Antonio lists a DOT exam fee of $80 with the medical card issued at the exam, open Monday through Saturday. Call to confirm current pricing and hours before you go. Our directory lists additional San Antonio clinics that perform DOT physicals, with phone numbers and addresses so you can compare.
If you do not pass
Not passing is usually temporary, not final. The most common outcome is a short-term disqualification until a condition is controlled: blood pressure brought down, diabetes managed, or a sleep study completed. Fix the issue, bring documentation, and re-examine.
You are allowed to seek another examiner's opinion, but every certified examiner works from the same federal standards and reports to the same registry. Shopping for a lenient examiner is a losing strategy. The faster path is treating the underlying issue and coming back with proof.
Keeping your card valid for the long haul
Passing the physical once is only the start. The drivers who never have a medical scare treat the card like the professional credential it is: they know their expiration date, schedule renewals a month early, and keep a folder with their medication list, specialist notes, and CPAP data ready to hand the examiner.
Between exams, the boring habits matter most. Blood pressure creeps up with age, weight, and stress, and it is the single most common reason for shortened cards. Regular checkups with your own doctor, honest medication compliance, and not letting small issues become big ones will do more for your career than any test-day trick. The examiners see thousands of drivers; they can tell who manages their health and who does not.
Find certified examiners across San Antonio with phone numbers, addresses, and directions.
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