I have sleep apnea and it is my understanding that it CAN cause you to fail your cdl physical. If you have a case where it only affects your sleep patterns and it can be corrected with the cpap machine you may qualify but if you have the kind that you can fall asleep at any time there is no way you will pass the physical. Here is the ruling:
391.41(b)(5)
A person is physically qualified to drive a commercial motor vehicle if that person:
Has no established medical history or clinical diagnosis of a respiratory dysfunction likely to interfere with the ability to control and drive a commercial motor vehicle safely.
Since a driver must be alert at all times, any change in his or her mental state is in direct conflict with highway safety. Even the slightest impairment in respiratory function under emergency conditions (when greater oxygen supply is necessary for performance) may be detrimental to safe driving.
There are many conditions that interfere with oxygen exchange and may result in incapacitation, including emphysema, chronic asthma, carcinoma, tuberculosis, chronic bronchitis and
sleep apnea. If the medical examiner detects a respiratory dysfunction, that in any way is likely to interfere with the driver's ability to safely control and drive a commercial motor vehicle, the driver must be referred to a specialist for further evaluation and therapy.
Anticoagulation therapy for deep vein thrombosis and/or pulmonary thromboembolism is not unqualifying once optimum dose is achieved, provided lower extremity venous examinations remain normal and the treating physician gives a favorable recommendation.
See Conference on Pulmonary/Respiratory Disorders and Commercial Drivers at:
http://www.fmcsa.dot.gov/rulesregs/medreports.htm
When you click on that link here is what they say about sleep apnea:
Obstructive Sleep Apnea
Individuals with suspected or untreated sleep apnea (symptoms of snoring and
hypersomnolence) should be considered medically unqualified to operate a commercial
vehicle until the diagnosis has been dispelled or the condition has been treated successfully.
In addition, as a condition of continuing qualification, commercial drivers who are being
treated for sleep apnea should agree to continue uninterrupted therapy as long as they
maintain their commercial driver’s license. They should also undergo yearly multiple sleep
latency testing (MSLT).
Further on in the report they give more details:
Recommendations
It is recommended that operators with suspected sleep apnea (symptoms of snoring and
hypersomnolence), or with proven but untreated sleep apnea, not be medically qualified for
commercial motor vehicle operation until the diagnosis has been eliminated or adequately
treated. Diagnosis of obstructive sleep apnea occurs when an individual has greater than 30
episodes during each hour of sleep or has hypersomnolence during waking hours associated
with any apnea activity (greater than five episodes per hour). The frequency and type of
apnea activity can only be accurately assessed following a polysomnographic sleep analysis.
Objective measures of sleepiness during waking hours now exist. Multiple sleep
latency testing (MSLT) measures the frequency with which subjects enter sleep during the
normal awake hours: Normal subjects do not fall asleep within the first 15 minutes of supine
inactivity in a quiet darkened room when tested during their usual waking hours. Individuals
with hypersomnolence repetitively enter sleep under similar circumstances in less than 10
minutes. With more severe sleep deprivation due to increasingly frequent apneic episodes,
subjects usually demonstrate shorter sleep latencies-some may fall asleep within 5 minutes
during MSLT. Successful therapy usually eliminates or decreases apneas and associated sleep
disruption, which decreases sleepiness during waking hours. The decreased sleepiness can be
measured both subjectively and objectively as improved MSLT.
This task force recommends that individuals with known OSA be allowed to obtain
certification to drive only after successful therapy has resulted in multiple sleep latency
testing values within the normal range or repeat sleep study during treatment that shows
resolution of apneas. Continuous successful therapy for 1 month usually results in major
improvements in pathological sleepiness. Sleep apnea subjects obtaining medical qualification
should agree, as a condition of continuing qualification, that their sleep apnea therapy will
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continue in an uninterrupted fashion while they maintain the operator’s certification. This
task force recommends the additional requirement of yearly multiple sleep latency testing or
repeat sleep study in individuals who have had the diagnosis of obstructive sleep apnea.