DOT Physical Readiness Check
Your numbers against the examiner's thresholds, before you book.
OpenHow to Pass a DOT Physical
8 min
49 CFR §391.41(b)
Nothing in the regulation says "pass" or "fail". The examiner decides whether you meet thirteen standards and for how long to certify you. Most drivers who lose time lose it to something they could have handled weeks earlier.
The five that cost cards
Across a working clinic the same handful of findings account for most short certifications and most deferrals. None of them are exotic.
| Finding | Usual outcome | Lead time to fix |
|---|---|---|
| Raised blood pressure | Shorter certificate, or a recheck | 3-8 weeks |
| Untreated sleep apnoea signs | Deferral pending a study | 4-10 weeks |
| Uncontrolled blood sugar | Deferral or the §391.46 pathway | 6-12 weeks |
| Vision below the standard | New correction, or the alternative standard | 1-3 weeks |
| Missing specialist letter | Deferral until it arrives | 2-6 weeks |
Notice the last row. A deferral for a missing letter is not a medical problem at all — it is an appointment problem, and it strands a driver for weeks over paperwork that existed the whole time.
What you can change in three weeks
Book the exam three or four weeks out rather than the week your card expires, and the window turns into a real one. Blood pressure responds to sleep, salt and taking the medication you were already prescribed. Vision responds to an up-to-date prescription — the standard is 20/40 Snellen, with or without correction, and correction counts, so an old pair of glasses is a solvable problem, not a disqualifying one.
If you take a medication that needs a treating-clinician letter, ask for it the day you book. Bring the original. Examiners will not certify on a photograph of a letter they cannot verify.
What to bring on the day
- 01Glasses or contact lenses, and hearing aids if you use them — both are allowed by the standard.
- 02A written list of every medication with doses, including the ones you take occasionally.
- 03Letters from treating clinicians for any monitored condition, on letterhead, signed and dated.
- 04Your CPAP compliance download if you use one — 30 days of data settles the question in a minute.
- 05Your last certificate, so the examiner can see the previous term and why it was set.
Skip the energy drink on the way in. Caffeine and nicotine in the hour before the reading are the cheapest way to turn a normal blood pressure into a short card.
If you get a short card
A three-month or one-year certificate keeps you working. Take it, put the recheck in the calendar the same day, and treat the interval as what it is: the examiner telling you exactly what to fix and giving you time to do it. A driver who arrives at the recheck with three months of readings usually walks out with the full 24 months.
Out-of-service risk. Driving after the certificate expires is not a warning-letter offence. An expired medical card at roadside places the driver out of service, and for a CDL holder the licence status downgrades until the new certification reaches the state.
Sources
- 49 CFR §391.41read 2026-09-04
- 49 CFR §391.45read 2026-09-04