A DOT physical is a medical exam required for anyone who drives a commercial motor vehicle, and it checks whether you can safely handle the physical demands of the job. The exam covers vision, hearing, blood pressure, urinalysis, and a full body systems check. Most drivers who pass receive a medical certificate valid for up to 24 months, though certain health conditions can shorten that window significantly.
Vision Standards
You need at least 20/40 vision in each eye, tested separately, with or without corrective lenses. Your binocular vision (both eyes together) also needs to hit 20/40 or better. Beyond sharpness, the examiner checks your peripheral vision, which must reach at least 70 degrees horizontally in each eye. You also need to correctly identify standard red, green, and amber traffic signal colors.
If you wear glasses or contacts to meet the 20/40 threshold, that’s fine, but your medical certificate will note that corrective lenses are required while driving. If you can’t meet the standard even with correction, you won’t pass.
Hearing Standards
The hearing test uses one of two methods. The simpler version is the forced whisper test: you need to hear a forced whisper from at least five feet away in your better ear, with or without a hearing aid. If your examiner uses an audiometric device instead, your average hearing loss in the better ear can’t exceed 40 decibels across three key frequencies. Hearing aids are allowed for both tests.
Blood Pressure Thresholds
Blood pressure is one of the most common reasons drivers get a shorter certification period or fail outright. The cutoffs work in tiers:
- Below 140/90: Full two-year certification.
- Stage 1 (140-159/90-99): One-year certification.
- Stage 2 (160-179/100-109): A one-time, three-month certificate. If your blood pressure drops below 140/90 within those three months, you can receive a one-year certification.
- Stage 3 (above 180/110): Disqualified. Once your readings come down below 140/90, you can be certified in six-month intervals.
If your blood pressure tends to run high, getting it under control before the exam can mean the difference between a two-year card and one that expires in months. Many drivers work with their doctor to adjust medications or lifestyle factors before scheduling the physical.
What the Physical Exam Covers
The examiner works through 14 body systems using the official Medical Examination Report Form (MCSA-5875). These include general appearance, skin, eyes, ears, mouth and throat, cardiovascular system, lungs and chest, abdomen, the genito-urinary system (including hernias), back and spine, extremities and joints, neurological function including reflexes, gait, and the vascular system. The examiner is looking for any abnormality that could impair your ability to drive safely.
This isn’t a deep diagnostic workup. It’s a screening exam. The examiner checks your range of motion, grip strength, reflexes, and overall physical function. If something raises concern, they may request additional testing or specialist clearance before issuing your certificate.
Urinalysis Requirements
Every DOT physical includes a urine test, but it’s not a drug screen. The medical urinalysis tests for glucose and protein levels, which help detect conditions like diabetes or kidney problems. This is a separate requirement from the controlled substances testing that employers handle under different federal rules. In fact, FMCSA policy generally prohibits using a drug-test urine sample for the medical exam, with only a narrow exception allowing leftover urine (after 60 milliliters have been set aside for drug testing) to be used for glucose and protein screening.
Diabetes and Insulin Use
Having diabetes doesn’t automatically disqualify you, but if you use insulin, there’s an extra step. You’ll need your treating clinician to complete an Insulin-Treated Diabetes Mellitus Assessment Form (MCSA-5870), which confirms you have a stable insulin regimen and properly controlled blood sugar. This form must be provided to the certified medical examiner within 45 days of your clinician completing it. Without it, the examiner can’t certify you.
Drivers with diabetes controlled through diet or oral medications face fewer hurdles, though the examiner will still evaluate your glucose levels and overall stability.
Medications That Can Disqualify You
Any Schedule I controlled substance automatically disqualifies you. So does use of amphetamines, narcotics, or other habit-forming drugs listed in federal drug schedules, unless you have a valid prescription and your prescribing doctor provides a written statement that you’re safe to drive commercially while taking the medication. Even then, the medical examiner has discretion and is not required to certify you.
Anti-seizure medications used for seizure prevention are disqualifying across the board. The examiner reviews every medication you take, including prescriptions, over-the-counter drugs, and supplements, and can request a letter from any prescribing doctor to evaluate whether a medication could impair your driving ability.
Sleep Apnea Screening
There’s no formal FMCSA rule mandating sleep apnea testing at a specific BMI, but an expert panel convened by the agency recommended that drivers with a BMI of 33 or higher be referred for a sleep study before certification. Many examiners follow this guidance in practice. Additional risk factors that may trigger a referral include a BMI of 28 or higher combined with other signs, or a neck circumference of 17 inches or more for men and 15.5 inches or more for women.
If you’re diagnosed with obstructive sleep apnea, you’ll typically need to demonstrate compliance with treatment (usually a CPAP machine) before the examiner will certify you. This often means shorter certification periods so compliance can be monitored.
Heart Conditions and Waiting Periods
A history of heart surgery or a pacemaker doesn’t permanently disqualify you. Coronary artery bypass surgery and pacemaker implantation are considered remedial procedures under federal guidelines. The key question is whether your cardiovascular condition has fully stabilized and whether it’s likely to cause fainting, shortness of breath, collapse, or heart failure. If you’ve had a cardiac event, you’ll need clearance from a cardiologist confirming your condition is stable before the examiner will issue a certificate.
How Long Your Certificate Lasts
The maximum certification period is 24 months. The examiner can issue a shorter certificate, anywhere from three months to one year, when a health condition needs monitoring. High blood pressure is the most common reason for a shorter card, but diabetes, sleep apnea, and cardiovascular conditions can also trigger reduced timelines. When your certificate expires, you’ll need a new exam to continue driving commercially. There’s no grace period.