The medical exam for a commercial driver's license is a physical and vision screening that the Federal Motor Carrier Safety Administration requires before you can drive a truck or bus professionally
The exam is not a full medical workup. A certified medical examiner — usually a doctor, nurse practitioner, or physician assistant — checks your vision, hearing, blood pressure, and ability to operate the vehicle safely. They review your medical history and current medications. The whole appointment typically takes 30 to 45 minutes.
You need to pass this exam to get your Commercial Driver's License (CDL) medical certificate, which is valid for two years. Some states allow one-year certificates under certain conditions. Without the certificate, you cannot legally drive a commercial vehicle, even if you have passed your CDL written and skills tests.
Key Takeaways
- The exam checks vision, hearing, blood pressure, and your ability to safely operate a commercial vehicle, and is performed by a certified medical examiner.
- You must bring a valid photo ID, proof of citizenship or legal residency, and a list of all medications and medical conditions you currently have.
- Common reasons for failing include uncorrected vision worse than 20/40, blood pressure above 160/100, or certain medical conditions like untreated diabetes or heart disease.
- If you fail, you can often retake the exam with a different examiner or after treating the condition that caused the failure.
- The medical certificate is valid for two years, though some states issue one-year certificates for drivers over 60 or with certain medical conditions.
What the examiner will check during your visit
The examiner will test your vision first. You need to see at least 20/40 in each eye, with or without glasses or contacts. If you wear corrective lenses, you must wear them during the exam. The examiner will also check your peripheral vision — your ability to see to the sides — because commercial driving requires awareness of a wide area.
Hearing is tested next, usually with a straightforward audio screening. You do not need perfect hearing, but you must be able to hear a forced whisper from five feet away in at least one ear. If you wear a hearing aid, you can use it during the test.
Blood pressure is measured while you are sitting. The limit is 160/100 millimeters of mercury. If your pressure is higher, you may fail on the spot, though some examiners will let you rest and retest. The examiner will also check your heart rate and listen to your heart and lungs with a stethoscope.
You will be asked to perform straightforward physical movements — touching your toes, standing on one leg, or walking in a straight line — to check your balance and coordination. The examiner is looking for signs that a medical condition might affect your ability to control a large vehicle.
Documents and information to bring
Bring a valid photo ID, such as a driver's license or passport. You will also need proof of citizenship or legal residency — a birth certificate, passport, or permanent resident card. Some examiners accept a Social Security card as supporting documentation, but check with your state's requirements first.
Write down all medications you take, including over-the-counter drugs and supplements. Include the dosage and how often you take each one. Bring a list of any medical conditions you have been diagnosed with, even if you think they are not serious. The examiner needs to know about diabetes, high blood pressure, sleep apnea, seizures, heart conditions, and mental health conditions that might affect your driving.
If you have had recent surgery, hospitalizations, or changes to your medications, bring documentation from your doctor. Some examiners will ask for a letter from your physician if you have a condition that might be borderline for passing.
Common reasons the exam is failed
Vision worse than 20/40 in both eyes, even with correction, is an automatic failure. If you fail for vision, you can often retake the exam after getting new glasses or contacts and trying again with a different examiner.
Blood pressure above 160/100 is grounds for failure. If this happens, you can usually retake the exam after a few weeks if you work with your doctor to bring your pressure down. Some examiners will retest you when ready if your first reading was high due to nervousness.
Certain medical conditions result in failure: uncontrolled diabetes, heart disease, a history of seizures without medical control, sleep apnea that has not been treated, and some psychiatric medications. You do not automatically fail because you have these conditions — you fail if the condition is untreated or if your doctor believes it makes driving unsafe.
Failing a drug or alcohol screening also results in failure. Some states require a drug test as part of the exam. If you test positive, you will need to complete a substance abuse program and pass a retest before you can get your certificate.
What happens if you fail
If you fail, the examiner will give you a written report explaining why. You have the right to request a retest with a different examiner, and many drivers do this if they believe the first examiner made an error.
If you failed because of a medical condition, your next step is to see your own doctor. Ask them whether the condition can be treated or managed so that you can pass on a second attempt. Bring the examiner's report with you so your doctor knows exactly what the concern was.
Some conditions require documentation from your physician before you can retake the exam. For example, if you failed because of high blood pressure, your doctor may need to write a letter confirming that your pressure is now controlled. If you failed because of diabetes, your doctor may need to provide records showing your blood sugar is stable.
You can retake the exam as soon as you have addressed the issue. There is no waiting period, though some states require you to wait a certain number of days between attempts. Check your state's rules before scheduling your second appointment.
Finding a certified medical examiner
Not every doctor can perform CDL medical exams. The examiner must be certified by the Federal Motor Carrier Safety Administration and listed on the National Registry of Certified Medical Examiners. Your state's Department of Transportation or motor carrier safety office maintains a list of certified examiners in your area.
You can search the National Registry online at fmcsa.dot.gov. Enter your state and city to find examiners near you. Many are primary care doctors, occupational health clinics, or urgent care centers. Some charge between $50 and $150 for the exam, though prices vary by location and provider.
Schedule your exam before you need your CDL. The medical certificate is valid for two years from the date of the exam, so you can take the exam and then study for your written test and skills test at your own pace.
How the certificate works once you pass
After you pass, the examiner will issue a Medical Examiner's Certificate, sometimes called a "medical card." This is a small card that you must carry with you whenever you drive a commercial vehicle. Some states print it directly on your CDL; others issue it as a separate document.
The certificate is valid for two years. If you are over 60 years old or have certain medical conditions, your state may issue a one-year certificate instead. You will receive a notice before your certificate expires, though it is your responsibility to schedule a new exam before the expiration date.
If your medical situation changes — for example, you are diagnosed with a new condition or start taking a medication that might affect driving — you should inform your state's motor carrier safety office. You may need to retake the exam before your certificate expires.
Frequently Asked Questions
Can I take the medical exam before I pass my CDL written test?
Yes. The medical exam and the written test are separate requirements. Many people take the medical exam first because it is straightforward and you know right away if you pass. You can then study for the written test without worrying about the medical certificate.
What if I wear glasses or contacts?
You must wear them during the exam if you wear them while driving. The examiner will test your vision with the correction in place. If you wear bifocals or progressive lenses, let the examiner know so they can check your vision at different distances.
Do I need to fast before the exam?
No fasting is required. The exam does not include blood work or a glucose test as part of the standard screening. However, if you have diabetes or your examiner suspects a blood sugar issue, they may ask you to return with lab results from your doctor.
What if I have a medical condition I am worried about?
Call the examiner's office before your appointment and describe the condition. They can tell you whether it will likely result in failure and whether you should bring documentation from your doctor. This saves you time and money if the condition is disqualifying.
How long does the medical certificate last?
The certificate is valid for two years from the date of the exam. If you are over 60 or have certain medical conditions, your state may issue a one-year certificate. Check your state's rules to know when you need to renew.