No CDL driver turns a wheel in interstate commerce without a current medical card. The DOT physical is quick and most people pass — but a handful of conditions can sideline you, and there are rules about who can even perform it. Here’s exactly what’s checked, what disqualifies, and how to keep your card current.
It’s a federally required (FMCSA) medical exam that certifies you’re fit to operate a commercial vehicle. Critically, it has to be done by a certified medical examiner listed on the FMCSA National Registry — even your own doctor can’t do it unless they’re on the registry, and a physical from a non-registered examiner isn’t valid. Verify the examiner before you book.
The core screens are vision (at least 20/40 in each eye, corrective lenses OK), hearing, and blood pressure (roughly 140/90 to certify a full term — higher gets you a shorter card or a hold until it’s controlled). The examiner also reviews your history — cardiovascular, respiratory, neurological, and diabetes. The urine sample checks for protein and glucose, not drugs; DOT drug testing is a separate, employer-run program.
Uncontrolled high blood pressure, poorly controlled diabetes, certain heart conditions, seizure disorders, and vision or hearing below standard can disqualify you. But many are certifiable once they’re controlled, or through an FMCSA exemption program (there are established pathways for vision and diabetes). The move is to get any condition managed before you test.
Expect about $60–$200 out of pocket — insurance usually doesn’t cover it because it’s a certification, not medical care. Specialized DOT clinics are often cheaper and faster than retail pharmacy clinics. A card is valid for up to 24 months, shorter if a condition needs monitoring.
Don’t let it lapse. An expired medical card means you can’t legally drive interstate and it can downgrade your CDL. Track the expiration date; many states now receive results electronically, but the responsibility to stay current is yours.
Bring your medication list and your glasses or hearing aids, get your blood pressure in check ahead of time, go easy on salt and caffeine before the visit, and use a DOT-focused clinic to save time. This is general information, not medical advice — verify current standards at FMCSA and with a certified examiner.
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