A DOT physical is a head-to-toe medical exam required for anyone who drives a commercial motor vehicle. It covers vision, hearing, blood pressure, heart and lung function, a urine test, and a review of your full medical history. The exam typically takes 30 to 45 minutes, and if you pass, you receive a medical certificate valid for up to two years.
The exam follows a standardized form (MCSA-5875) set by the Federal Motor Carrier Safety Administration, so the process is the same regardless of where you go. Here’s what happens at each step.
Health History Review
Before any physical tests begin, you’ll fill out a detailed medical history form. It asks about past surgeries, current medications, and whether you’ve ever been diagnosed with conditions like diabetes, heart disease, epilepsy, sleep apnea, or psychiatric disorders. You’ll also report any history of fainting, dizziness, or head injuries. Be honest here. The examiner uses your answers to decide which areas need closer evaluation, and falsifying your history can result in losing your certification later.
Vision Test
You need at least 20/40 vision in each eye and 20/40 with both eyes together, with or without corrective lenses. The examiner will also check your peripheral vision, which must reach at least 70 degrees in each eye (for a combined horizontal field of 140 degrees). You’ll be tested on color recognition as well, since you need to distinguish traffic signal colors: red, green, and amber. Telescopic lenses are not permitted. If you wear glasses or contacts to meet the standard, that will be noted on your medical certificate.
Hearing Test
The hearing check usually starts with a whisper test. You’ll stand five feet from the examiner with one ear turned toward them while covering the other. The examiner whispers a series of words or numbers, and you need to repeat them correctly. If you can’t pass the whisper test, you’ll take a formal audiometric test instead. The threshold there is an average hearing loss no greater than 40 decibels across three key frequencies in your better ear. Hearing aids are allowed for both tests.
Blood Pressure and Pulse
Blood pressure is one of the most common reasons drivers receive a shortened certificate or fail outright. The thresholds are specific:
- Below 140/90: Full two-year certification.
- 140-159/90-99 (Stage 1): One-year certification.
- 160-179/100-109 (Stage 2): A one-time, three-month certificate. If your blood pressure drops below 140/90 within that window, you can receive a one-year certificate.
- 180/110 or higher (Stage 3): Disqualified. You cannot be certified until your blood pressure is under control.
If you take blood pressure medication, bring it with you and take it as normal before the exam. The examiner cares about where your numbers land that day, not whether you use medication to get there.
Urinalysis
You’ll provide a urine sample during the exam, but this is not a drug test. The urinalysis screens for sugar (glucose), protein, and blood in your urine. Elevated glucose can indicate undiagnosed or poorly controlled diabetes. Protein or blood may signal kidney problems. If anything comes back abnormal, the examiner may request follow-up testing before issuing your certificate.
The DOT drug test is a completely separate requirement handled by your employer, not the medical examiner. That test screens for marijuana, cocaine, opiates, amphetamines, and PCP.
Physical Examination
The examiner works through each body system, checking for anything that could impair your ability to safely operate a commercial vehicle. This includes:
- Heart and lungs: Listening with a stethoscope for irregular heartbeats, murmurs, or abnormal breath sounds.
- Abdomen: Checking for hernias, organ enlargement, or masses.
- Spine and musculoskeletal system: Evaluating range of motion, limb strength, and grip. You need enough mobility and strength to handle steering, braking, and securing cargo.
- Neurological function: Testing reflexes, coordination, and balance to rule out conditions that could cause sudden incapacitation.
- Skin: Looking for signs of underlying disease, such as jaundice or skin conditions that suggest circulatory problems.
The examiner visually inspects your body and will ask you to perform simple movements like squatting, walking heel-to-toe, or gripping objects. Each system is marked normal or abnormal on the exam form, and any abnormality gets documented with notes on whether it affects your driving ability.
Conditions That Can Disqualify You
Four conditions are specifically listed as disqualifying under federal regulations: significant hearing loss, vision loss below the required standards, epilepsy, and insulin-treated diabetes. However, having one of these doesn’t necessarily mean you’re permanently out. Exemption programs exist for each.
For seizure disorders, the rules depend on the type of seizure. A diagnosis of epilepsy requires you to be seizure-free for eight years before you can apply for a federal exemption, and your medication plan must have been stable for at least two years. A single unprovoked seizure has a shorter waiting period of four years seizure-free. A single provoked seizure (one with a known trigger, like a medication reaction) may have a shorter path depending on your recurrence risk. Drivers with seizure exemptions are recertified every one to two years.
If you use insulin to manage diabetes, you’ll need your treating clinician to complete a separate assessment form (MCSA-5870) confirming your insulin regimen is stable and your diabetes is properly controlled. That form must be submitted to the medical examiner within 45 days of your clinician completing it. Insulin-treated drivers are certified for one year at a time rather than two.
Other conditions don’t automatically disqualify you but will shorten your certificate or require additional documentation. Heart disease, treated high blood pressure, and sleep disorders like sleep apnea typically result in a one-year certificate with the expectation that you’re being monitored and treated.
What to Bring to Your Appointment
Come prepared with a list of your current medications (names and dosages), your glasses or contacts if you use them, and any hearing aids. If you have a condition like diabetes, sleep apnea, or a heart condition, bring documentation from your treating physician showing that it’s being managed. For insulin-treated diabetes specifically, you’ll need the completed ITDM Assessment Form. If you’ve had any recent surgeries or hospitalizations, bring discharge summaries.
Your driver’s license and any previous medical certificates are also helpful for the examiner to have on hand.
How Long the Certificate Lasts
A standard DOT medical certificate is valid for two years. Several conditions shorten that to one year: high blood pressure that’s stable on treatment, heart disease, insulin-treated diabetes, and vision or diabetes waivers. The examiner can also issue a shorter certificate at their discretion if they believe a condition needs more frequent monitoring. Stage 2 high blood pressure results in a three-month certificate as a one-time bridge to get your numbers down.
Your medical certificate must stay current for as long as you hold a commercial driver’s license. When it expires, you’ll need to complete the full exam again from scratch.