CDL medical card and sleep apnea: what commercial drivers should know
How the DOT physical works, what can limit your card and how sleep apnea is handled
Every commercial driver knows the DOT physical. Fewer know how much has changed lately. The paper medical card is being replaced by an electronic system. And sleep apnea, a common and treatable condition, has become one of the most talked about parts of the exam.
This guide explains how the medical card works, what can shorten or block it, and how to handle sleep apnea without losing your livelihood.
Who needs a medical card
Drivers of commercial motor vehicles in interstate commerce must be medically qualified. That generally covers vehicles over 10,000 pounds, vehicles that carry 9 to 15 people for pay or 16 or more people, and placarded hazardous material loads. States set their own rules for drivers who never cross state lines.
The exam must be done by a medical examiner listed on FMCSA’s National Registry of Certified Medical Examiners. You can search the registry online by ZIP code [1].
How long a card lasts
A medical certificate is good for up to 24 months. The examiner can issue a shorter card if a condition needs watching. Common examples include high blood pressure, diabetes and sleep apnea under treatment.
Under FMCSA examiner guidance, blood pressure readings affect card length. A driver with mildly high pressure may get a one year card. Higher readings can mean a short, one time card to get treatment, and very high readings can disqualify a driver until the pressure is controlled.
The new electronic system
Since June 23, 2025, medical examiners send exam results to FMCSA electronically. FMCSA passes the results to the state driver licensing agency, which updates the driver’s record [2].
A few states were slow to connect to the system. In April 2026, FMCSA granted a six month exemption because five states had not yet put the rule in place. It let drivers use a paper copy of the medical certificate for up to 60 days after the exam. The exemption ran through October 11, 2026 [2].
The safe habit is simple. Keep a copy of your certificate until you confirm your state record shows it. Check your driving record after each exam.
What the exam checks
The DOT physical looks at health problems that could cause a sudden loss of control or slow reactions. Key areas include:
- Vision. At least 20/40 in each eye, with or without glasses, and enough side vision. You must be able to tell traffic signal colors apart.
- Hearing. You must hear a forced whisper at 5 feet in at least one ear, or pass a hearing test.
- Blood pressure and heart health.
- Diabetes. Drivers who use insulin can qualify. Their treating clinician fills out a special assessment form first.
- Seizures and nervous system conditions.
- Medicines. Some drugs, such as certain opioids and sedatives, can disqualify a driver.
- Sleep problems. Including sleep apnea.
Be honest on the health history form. Leaving things out can lead to a revoked card and legal trouble later.
Sleep apnea: why it matters
Obstructive sleep apnea causes breathing to stop and start during sleep. FMCSA says the pauses can last at least 10 seconds and happen up to 400 times a night [3]. The result is poor sleep and heavy daytime sleepiness.
It is common among truck drivers. A study sponsored by FMCSA and the American Transportation Research Institute found that 28 percent of commercial truck drivers had mild to severe sleep apnea [3].
Common signs include [3]:
- Loud snoring, gasping or choking in sleep
- Feeling very sleepy during the day
- Morning headaches
- Trouble focusing or remembering
- A large neck size (17 inches or more for men, 16 or more for women)
What the rules say about sleep apnea
FMCSA’s regulations do not mention sleep apnea by name. But any condition likely to interfere with safe driving can disqualify a driver. FMCSA says moderate to severe sleep apnea that interferes with safe driving is disqualifying, and the medical examiner decides [3].
FMCSA and the Federal Railroad Administration started work on a formal sleep apnea rule in 2016. They withdrew it in 2017 [4]. So screening still rests on each examiner’s medical judgment.
In practice, an examiner who sees risk factors may refer you for a sleep study. Some examiners issue a short card while you get tested.
Treatment keeps drivers on the road
Most sleep apnea can be treated well. The most common treatment is CPAP, a machine that keeps the airway open with gentle air pressure during sleep. Modern machines record how often you use them. Examiners often ask for this data.
A common benchmark in sleep medicine, also used by Medicare, is using CPAP at least 4 hours a night on at least 70 percent of nights.
Treatment works. A University of Minnesota study looked at more than 1,600 truck drivers with sleep apnea at one large carrier. Drivers who did not use their treatment had five times the rate of serious preventable crashes. Drivers who used their treatment had the same low crash rate as drivers without sleep apnea [5].
Checklist before your DOT physical
Checklist from Safety Behind the Wheel Foundation
- I found an examiner on the National Registry
- I brought glasses, contacts or hearing aids I use
- I brought a list of all my medicines and doses
- I brought records for any heart, diabetes or sleep conditions
- If I use CPAP, I brought my usage report
- I answered the health history form honestly
- After the exam, I checked that my state record was updated
Frequently asked questions
Can I lose my CDL because of sleep apnea?
Not if it is treated and you use your treatment. Untreated moderate to severe sleep apnea can keep you from being certified until it is treated.
Can my company pay for a sleep study?
Many carriers have sleep apnea programs that cover testing and equipment. Ask your safety department.
What if my examiner and my own doctor disagree?
Drivers can ask FMCSA to resolve medical disagreements in some cases. You can also see a different certified examiner, but you must report past exams honestly.
Related articles
Sources and further reading
- 1Federal Motor Carrier Safety Administration. “National Registry of Certified Medical Examiners.” nationalregistry.fmcsa.dot.gov
- 2Federal Register. “Qualification of Drivers; Commercial Vehicle Safety Alliance; Application for Exemption” (FMCSA-2026-0265). April 14, 2026. govinfo.gov/…/2026-07173.htm
- 3Federal Motor Carrier Safety Administration. “Driving When You Have Sleep Apnea.” fmcsa.dot.gov/…/driving-when-you-have-sleep…
- 4Waste Dive. “FMCSA withdraws proposed sleep apnea rule due to logistical concerns.” 2017. wastedive.com/…/448855
- 5University of Minnesota Center for Transportation Studies. “Study finds higher crash risk for truckers with untreated sleep apnea.” 2016. cts.umn.edu/…/truckers
This article reflects the safety priorities of commercial driver health and fatigue prevention. It is general education, not medical or legal advice. Check FMCSA and your medical examiner for current standards. Reviewed November 2026.
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