Sleep apnea and the DOT physical
There is no FMCSA regulation that names sleep apnea. Examiners screen for it under the general respiratory standard, using risk factors — which is exactly why drivers get different answers from different clinics. Here's what's actually going on and what to bring.
What triggers a referral
Examiners look for a cluster of risk factors, not one number. The more of these you check, the more likely a sleep study referral:
- BMI of 33 or higher (many examiners use 35)
- Neck circumference over 17 inches for men, 16 for women
- Loud snoring, witnessed pauses in breathing, or gasping at night
- Falling asleep during the day, or nodding off behind the wheel
- High blood pressure that needs two or more medications to control
- Type 2 diabetes or hypothyroidism
- Age 42 or older, and being male or post-menopausal
- A history of a sleep-related crash
These come from medical examiner training guidance built on the general physical qualification standard in 49 CFR 391.41(b)(5). They are advisory, not a fixed legal test, so individual examiners apply them differently.
If you're already on CPAP
Bring your compliance report. Most examiners want to see use on at least 70 percent of nights for at least 4 hours a night over a recent 30-day period. Your machine records this; your equipment supplier can print or email it.
Treated and compliant apnea is not a disqualifier — plenty of drivers hold full cards on CPAP. The problems are non-compliance and untreated moderate-to-severe apnea.
If you want off the machine, the path is weight loss plus a repeat sleep study, not quitting on your own.
Sleep apnea & DOT FAQ
Is there a DOT sleep apnea regulation?+
There is no separate FMCSA rule that names obstructive sleep apnea. Examiners act under the general standard in 49 CFR 391.41(b)(5), which disqualifies a respiratory condition likely to interfere with safe driving. That's why practice varies between examiners.
What BMI triggers a sleep study for a DOT physical?+
There is no legally fixed number. Widely used guidance from medical examiner training flags a BMI of 33–35 or higher, especially combined with a large neck circumference, high blood pressure, or reported daytime sleepiness.
Does sleep apnea disqualify you from driving a truck?+
No. Treated, compliant sleep apnea does not disqualify you. Untreated moderate-to-severe apnea, or non-compliance with treatment, is what puts your certification at risk.
How much CPAP use do I need to show?+
Most examiners want a compliance download showing use on at least 70 percent of nights, at least 4 hours per night, typically over a recent 30-day window. Bring the data card or the report from your equipment supplier.
What card do I get if I'm referred for a sleep study?+
Examiners often issue a short certificate — commonly 90 days — while you complete the study and start treatment, then certify you for up to a year once compliance is documented.
Can losing weight get me off CPAP?+
Weight loss can meaningfully reduce apnea severity for some people, and a repeat sleep study is what confirms it. Never stop CPAP on your own — that shows as non-compliance and can cost you your card.
Most of these risk factors move with weight.
Cab-Fit gives you 10-minute workouts you can do at the rig, truck-stop meals with USDA-verified macros, and weight tracking so you can see the trend before your next exam.
General information, not medical advice. Your certified medical examiner and your doctor make the call on treatment and certification.