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What a DOT physical actually checks, and what trips drivers up

The exam is set by federal rule, not by the clinic. Knowing the thresholds in advance is the difference between a two-year card and a two-week delay.

Two workers discussing plans on a sandy construction site, wearing safety gear.
Marcus Okonkwo, DO · 30 July 2026

A Department of Transportation physical is not a health check. It is a fitness-for-duty examination against a federal standard in 49 CFR 391.41, performed by an examiner listed on the FMCSA National Registry, and it answers exactly one question: can this person safely operate a commercial vehicle.

Drivers lose time over the same handful of things every year. Here is what we look at and where the delays come from.

Vision

You need at least 20/40 distant visual acuity in each eye separately and both together, with corrective lenses if you use them, along with at least 70 degrees of horizontal field of vision in each eye and the ability to recognise standard traffic signal colours.

The commonest avoidable problem is arriving without your glasses or contacts. If you wear them, wear them to the exam. Monocular vision does not disqualify you outright but it requires a federal vision exemption, which takes time to obtain.

Hearing

The standard is the ability to perceive a forced whisper at five feet or less, in at least one ear, with or without a hearing aid. An audiometric test is an accepted alternative, with a defined average threshold limit across 500, 1000 and 2000 Hz.

If you use a hearing aid, bring it and bring working batteries.

Blood pressure, the biggest single cause of a short card

Blood pressure below 140/90 supports a full two-year certificate. Between 140/90 and 159/99 the examiner may issue a one-year certificate. Between 160/100 and 179/109 you can receive a one-time three-month certificate, and once treated to below 140/90 you may then be certified for one year at a time. At 180/110 or above you are disqualified until treated and controlled.

Drivers frequently arrive dehydrated, on very little sleep, after several coffees and a stressful drive across town. Come rested, take your usual medication, and bring the bottle so we can document it.

Sleep apnoea and what we actually ask for

There is no federal rule that mandates sleep apnoea testing, but examiners must assess whether a condition is likely to interfere with safe driving. Neck circumference, body mass index, reported snoring and witnessed apnoeas all feed into that judgement.

If you are already treated with CPAP, bring a compliance download covering a recent period. Without it, we cannot document that the condition is controlled, and that is one of the most common reasons a certificate ends up short.

Diabetes, and the 2018 change

Insulin-treated diabetes no longer requires a federal exemption. Since 2018 the pathway runs through form MCSA-5870, completed by your treating clinician, confirming stable control and no severe hypoglycaemic episode in the relevant look-back period. Bring that form completed, along with recent glucose records.

The urinalysis, which is not a drug test

The DOT physical includes a urine specimen tested for protein, blood, sugar and specific gravity. It screens for kidney disease and undiagnosed diabetes. It is not a drug screen, and the two are separate procedures under separate rules, even when they happen in the same visit.

What to bring, in one list

Walk in during occupational hours, weekdays until 6 pm, with this in hand.

  • Your driver's licence
  • Glasses or contact lenses, and hearing aids if you wear them
  • A complete medication list with doses and prescribing clinicians
  • CPAP compliance report if you are treated for sleep apnoea
  • MCSA-5870 completed by your clinician if you use insulin
  • Specialist letters for any cardiac, neurological or seizure history
  • A recent blood pressure log if yours runs high in clinic

What to take away

  • The certificate can run up to 24 months, but blood pressure and sleep apnoea documentation are what usually shorten it.
  • Bring the corrective lenses and hearing aids you actually use.
  • CPAP compliance data prevents the most common delay we see.
  • The DOT urinalysis screens for kidney disease and diabetes. It is not a drug screen.

Call 911 instead, right now, for any of these

  • Chest pain or pressure, especially spreading to the arm, jaw or back
  • Sudden face droop, arm weakness or slurred speech: act FAST and call 911
  • Trouble breathing, or being unable to speak a full sentence
  • Heavy bleeding that will not stop with firm pressure

QuickCare is an urgent care clinic. We do not treat life-threatening emergencies, and we will call an ambulance for you if you arrive with one.

General information only, not medical advice. It cannot replace an examination, and it does not create a provider and patient relationship. If this is a medical emergency, call 911.

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