The CDL medical exam is a physical and vision test required before you can get or renew a commercial driver's license

To drive a commercial truck, bus, or other large vehicle for work, you must pass a medical exam performed by a certified medical examiner. This exam checks whether you are physically and mentally fit to operate a commercial vehicle safely. The exam is not optional — you cannot get a CDL without it, and you cannot renew one without passing again.

The exam itself takes 30 to 60 minutes and covers your vision, hearing, blood pressure, and medical history. A medical examiner will ask about past injuries, medications, sleep disorders, and other conditions that affect your ability to drive. You will also take a vision test and have your blood pressure checked. The examiner then fills out a form called the Medical Examination Report for Commercial Driver Fitness information (MCSA-5875) and sends it to your state's DMV.

If you pass, the examiner gives you a Medical Certificate (also called a Medical Examiner's Certificate) that is valid for either one or two years, depending on your medical history. If you fail, you will not be able to get a CDL until you address the medical issue and pass a new exam with a different examiner.

Key Takeaways

  • The medical exam must be performed by a certified medical examiner listed on the Federal Motor Carrier Safety Administration (FMCSA) National Registry, not your regular doctor.
  • You will be tested on vision (at least 20/40 in each eye with or without correction), hearing, blood pressure, and your medical history including any medications you take.
  • Certain conditions — including untreated sleep apnea, uncontrolled diabetes, heart disease, and some psychiatric medications — can result in failure or a restricted certificate.
  • The Medical Certificate is valid for one or two years; you must renew it before it expires or you lose your right to drive commercially.
  • You can find a certified examiner through the FMCSA National Registry website or by calling your state's DMV.

What the medical examiner will check

The exam covers your overall fitness to operate a large vehicle safely. The examiner will measure your blood pressure, test your vision and hearing, and check your ability to move and balance. You will be asked to read an eye chart and may be tested on your ability to distinguish colors if your job requires it.

The examiner will also review your medical history in detail. They will ask about past surgeries, injuries, chronic illnesses, medications, and conditions like diabetes, heart disease, epilepsy, or sleep apnea. Be honest — the examiner is not trying to trick you, and hiding a condition can result in a failed exam or, worse, an accident on the road. If you take any medications, bring the bottles or a list with you so the examiner can see the names and dosages.

The examiner will also ask about your sleep habits, any history of substance abuse, and whether you have ever been diagnosed with a mental health condition. These questions matter because fatigue and certain medications affect your reaction time and judgment.

Conditions that may cause you to fail or receive restrictions

Some medical conditions do not automatically disqualify you, but they may result in a restricted certificate — meaning you can drive commercially but only under certain conditions, such as daylight hours only or within a certain distance of your home. Other conditions will result in failure unless you get special medical certification.

Untreated or poorly controlled sleep apnea is one of the most common reasons for failure. If you snore heavily, wake up gasping, or feel exhausted during the day, tell the examiner. You may need a sleep study before you can pass. Uncontrolled high blood pressure, uncontrolled diabetes, and a history of heart attack or stroke can also result in failure. Some psychiatric medications, particularly those used for bipolar disorder or schizophrenia, may disqualify you unless you have been stable on the medication for a set period.

Vision problems are common but often manageable. If you cannot meet the 20/40 vision standard in each eye with glasses or contacts, you will fail. Hearing loss alone does not usually disqualify you unless it is severe, but the examiner will test it. If you have had a seizure in the past, you may need to show that you have been seizure-free for a certain period before the examiner will certify you.

How to prepare for your exam

Start by gathering your medical records and a list of all medications and supplements you take, including dosages. If you have been diagnosed with any chronic condition — diabetes, high blood pressure, heart disease, sleep apnea, or anything else — bring documentation showing that it is being treated and controlled. If you wear glasses or contacts, bring them to the exam.

Schedule your exam with a certified medical examiner from the FMCSA National Registry. You can search for examiners in your area on the FMCSA website or ask your state's DMV for a list. Call ahead to confirm the examiner is still certified and to ask what documents you should bring. Some examiners have specific requirements or accept appointments only on certain days.

Get a good night's sleep before your exam and eat a light meal. Avoid caffeine or heavy meals right before the appointment, as they can affect your blood pressure reading. Wear comfortable, loose-fitting clothing so the examiner can check your blood pressure accurately. If you know your blood pressure tends to be high when you are nervous, mention this to the examiner — they may take a second reading after you have had time to relax.

What happens after you pass

Once you pass, the examiner will issue your Medical Certificate. This certificate is valid for either one or two years. The length depends on your age and medical history — if you are over 49 or have certain medical conditions, you may receive a one-year certificate instead of two years. The examiner will tell you the expiration date.

You must carry your Medical Certificate with you whenever you drive commercially. It is a separate document from your CDL itself. When you renew your CDL, you will need to show a valid Medical Certificate. If your certificate expires before your CDL does, you lose the right to drive commercially until you pass a new exam and get a new certificate.

Keep track of your expiration date and schedule your next exam at least a month before it expires. If your certificate expires, you will have to take the full medical exam again — there is no grace period.

What to do if you fail the exam

If the examiner does not certify you, ask for a written explanation of why. The examiner must provide this in writing. The reason might be a condition that needs treatment, a medication that needs adjustment, or additional testing (like a sleep study) that you need to complete.

Once you have addressed the issue — whether that means starting treatment, changing medications, or getting test results — you can schedule an exam with a different certified examiner. You cannot go back to the same examiner for 30 days, so plan accordingly. Some conditions require you to get a special medical opinion or clearance from a specialist before any examiner will certify you.

If you believe the examiner made an error, you can request a second opinion from another certified examiner. Keep all documentation of your medical treatment and test results, as you will need to show these to the new examiner.

Finding a certified medical examiner

Not every doctor can perform CDL medical exams. The examiner must be listed on the FMCSA National Registry of Certified Medical Examiners. You can search this registry on the FMCSA website by entering your state and city. The registry shows the examiner's name, location, phone number, and whether they are currently certified.

Call ahead to confirm the examiner is still active and to ask about their hours and fees. Exam costs vary by location but typically range from $75 to $150. Some examiners may charge more if additional testing is needed. Ask whether they accept your insurance or if payment is cash only.

If you cannot find an examiner near you, contact your state's DMV or commercial driver's license office. They can provide a list of certified examiners in your area or nearby. Some rural areas have fewer examiners, so you may need to travel to the nearest city.

Frequently Asked Questions

Can my regular doctor perform the CDL medical exam?

No. Your regular doctor must be certified by the FMCSA and listed on the National Registry to perform a CDL medical exam. Even if your doctor is a physician, they cannot legally perform this exam unless they have completed the FMCSA certification process. You must use a certified examiner.

What if I take medication that might disqualify me?

Tell the examiner about all medications you take, including dosages. Some medications do not disqualify you; others may result in a restricted certificate or require a specialist's clearance. The examiner will review your specific situation. Do not hide medications — this can result in failure or safety risks on the road.

How long does the medical certificate last?

Your Medical Certificate is valid for one or two years, depending on your age and medical history. The examiner will tell you the expiration date when you pass. You must renew it before it expires or you cannot drive commercially. There is no grace period.

What if I fail the exam — can I try again right away?

You must wait 30 days before you can take the exam again, and you must use a different certified examiner. During that time, address the medical issue that caused the failure — whether that means starting treatment, adjusting medications, or getting test results from a specialist.

Do I need to bring anything to the exam?

Bring your glasses or contacts if you wear them, a list of all medications and supplements with dosages, and any medical records related to chronic conditions you have been diagnosed with. Call the examiner ahead of time to ask if they need any other documents.