DOT Medical Card Basics for CDL Drivers
You can't drive a commercial truck interstate without a valid DOT medical certificate, often called a "med card." Let it lapse and you're not qualified to drive, no matter how clean your record is. Here's how the federal physical works and how to stay current.
This is a plain-English summary of the federal rules for interstate drivers, not medical or legal advice. The official sources are 49 CFR Part 391, Subpart E (sections 391.41 through 391.49) and FMCSA's driver medical fitness pages. States can have their own rules for intrastate-only drivers.
Who Can Do Your DOT Physical
Only a medical examiner listed on FMCSA's National Registry of Certified Medical Examiners can certify you. That can be a doctor, nurse practitioner, physician assistant or chiropractor, but they must have taken the training and passed the test to get on the Registry. A physical from your regular doctor doesn't count unless they're on it. Search the Registry by ZIP code before you book.
What the Exam Checks
The physical qualification standards are in 49 CFR 391.41. You fill out a health history form, and the examiner checks things like:
- Vision: at least 20/40 in each eye and both eyes together (glasses or contacts allowed), a 70-degree field of vision in each eye, and the ability to tell the colors of traffic signals apart. Drivers who don't meet the standard in one eye may qualify under the alternative vision standard in 391.44.
- Hearing: hearing a forced whisper at 5 feet or more in the better ear, with or without a hearing aid, or passing an audiometric test.
- Blood pressure, heart and lungs: conditions that could cause sudden loss of control or ability to drive safely.
- Diabetes: insulin-treated diabetes is no longer an automatic disqualifier. Under 391.46, your treating clinician fills out an assessment form, and the examiner decides.
- Nervous system and mental health: epilepsy, conditions that cause loss of consciousness, and mental conditions that affect safe driving.
- Drugs and alcohol: use of Schedule I drugs, current alcoholism, or other controlled substances not prescribed by a licensed provider who knows your job is disqualifying.
- Urinalysis: a dipstick test for health screening. This is not a drug test; a DOT drug test is separate.
Bring a list of your medications and any paperwork from specialists you see. It can save you a second trip.
How Long the Card Lasts
The longest a medical examiner's certificate can be issued for is 24 months. If you have a condition the examiner wants to keep an eye on, such as high blood pressure, you may get a shorter card, sometimes one year or less. The expiration date is on the certificate. Schedule your next physical a few weeks before it runs out.
Getting the Card to Your State
CDL holders who drive interstate must self-certify their type of driving with their state licensing agency and keep their medical status current with that state. FMCSA's National Registry now sends exam results from the examiner to the state electronically, but check with your state DMV that your status shows up correctly. If the state's record shows your medical certification expired, it can downgrade your CDL. Keep a copy of your certificate in case a carrier or officer asks for it.
Habits That Keep You Qualified
- Put your expiration date on your calendar and book the next exam a month early.
- Be honest on the health history. Leaving things off can cost you your certificate later.
- Manage blood pressure, blood sugar and sleep apnea between exams so you keep a full-length card.
- Check your state record after every physical so a paperwork gap doesn't sideline you.
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