A DOT physical is a standardized medical exam required for commercial motor vehicle drivers. It covers vision, hearing, blood pressure, urinalysis, and a head-to-toe physical assessment to confirm you’re healthy enough to safely operate a large vehicle. The exam typically takes 30 to 45 minutes and results in a medical certificate valid for up to two years.
Medical History Review
Before the hands-on exam begins, you’ll fill out the medical history section of the Medical Examination Report Form (MCSA-5875). This is a detailed questionnaire covering past surgeries, current medications, and any history of conditions like heart disease, seizures, diabetes, breathing problems, or sleep disorders. Be thorough and honest here. The examiner uses your answers to guide the rest of the exam, and undisclosed conditions discovered later can result in losing your certification.
Vision Test
You need at least 20/40 vision in each eye individually, plus 20/40 with both eyes together. Glasses or contacts are fine, but you’ll need to meet the standard with them on every time you drive. The examiner also checks that your field of vision reaches at least 70 degrees to each side in both eyes, which ensures you can see vehicles and obstacles in your peripheral vision. You’ll be tested on your ability to distinguish red, green, and amber, the three colors used in traffic signals.
If you can’t meet the vision standard in one eye, you’re technically disqualified from interstate driving unless you apply for and receive a federal vision exemption.
Hearing Test
The hearing check uses one of two methods. In the forced whisper test, the examiner stands five feet away while you turn your ear toward them, and you need to hear a whispered voice from that distance in at least one ear. Alternatively, an audiometric test measures hearing loss across three frequencies. To pass, your better ear can’t have an average loss greater than 40 decibels across those frequencies. Hearing aids are allowed for both tests.
Blood Pressure Check
Blood pressure is one of the most consequential parts of the exam because it directly determines how long your certificate lasts. The thresholds break down like this:
- 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 those three months, you can get bumped up to a one-year certification.
- Above 180/110 (Stage 3): Disqualified. Once your blood pressure comes down below 140/90 with treatment, you can be certified in six-month intervals.
If you’re borderline, it’s worth knowing that anxiety during the exam can spike your numbers. Some drivers benefit from arriving early, sitting quietly for a few minutes, and avoiding caffeine that morning.
Urinalysis
You’ll provide a urine sample, but this is not a drug test. The DOT physical urinalysis screens for glucose and protein levels. Glucose in urine can signal uncontrolled diabetes, while protein may point to kidney problems. Both are flags that prompt the examiner to investigate further before certifying you. A separate drug and alcohol test may be required by your employer under different DOT regulations, but that’s a distinct process from the physical itself.
Physical Examination
The examiner does a head-to-toe check covering your heart, lungs, abdomen, spine, and extremities. They’re listening for irregular heart rhythms, labored breathing, or signs of hernia. They’ll check your reflexes and neurological function, looking for anything that could cause sudden incapacitation behind the wheel. Your range of motion matters too, since driving a commercial vehicle requires the ability to grip a steering wheel, operate pedals, and check mirrors and blind spots.
The examiner also evaluates your overall build and appearance for signs of conditions you may not have reported. A large neck circumference or high BMI can trigger further screening for sleep apnea, which is a major concern for commercial drivers because untreated cases cause excessive daytime sleepiness. FMCSA expert panel recommendations flag drivers with a BMI of 33 or higher, a neck circumference over 17 inches for men or 15.5 inches for women, or visible risk factors like a narrow airway. If the examiner suspects sleep apnea, you may receive a conditional one-month certificate while you complete a sleep study.
Conditions That Can Disqualify You
Four conditions are specifically disqualifying under federal regulations: significant hearing loss, vision loss that can’t be corrected to the standard, epilepsy, and insulin-treated diabetes. That said, disqualification doesn’t always mean permanent. Drivers with insulin-treated diabetes can pursue certification through an additional process that requires their treating clinician to complete a separate assessment form (MCSA-5870) confirming a stable insulin regimen and properly controlled blood sugar. That form must be provided to the certified medical examiner within 45 days of the clinician completing it.
Beyond the four named conditions, examiners have discretion to disqualify or shorten certification for anything they believe poses a safety risk. Heart disease, poorly controlled diabetes managed without insulin, and sleep disorders are common reasons for a one-year certificate instead of two years.
What You Walk Away With
If you pass, the examiner issues a Medical Examiner’s Certificate (Form MCSA-5876). This is the card you carry as proof of medical fitness. The standard certificate is valid for two years, but as outlined above, certain conditions shorten that window to one year, six months, or even three months. Your results are also reported to the FMCSA’s National Registry, which shares them with your state licensing agency so your commercial driver’s license stays linked to a current medical certification.
If you don’t pass, the examiner will explain what condition caused the issue and whether it’s something that can be addressed with treatment, a waiver, or an exemption program. You’re not locked out permanently in most cases. You simply need to resolve the medical issue and return for re-examination.