Sleep disorders Testing
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Sleep disorders Testing

Objective Tests for Sleep Disorders
When indicated, objective sleep tests may be required to determine the presence of a sleep disorder.
Objective tests for sleep disorders include:
  • Polysomnography in a controlled sleep laboratory.
  • Napping tests:
    • Maintenance of wakefulness test.
    • Multiple sleep latency test.
Definitions:
  • Apnea – airflow ceases for more than 10 seconds.
  • Hypopnea – airflow decreases for more than 10 seconds.
Severity (apnea-hypopnea index):
  • Mild – 5+ episodes/hour.
  • Moderate – 15+ episodes/hour.
  • Severe – 30+ episodes/hour.
More than 30 episodes per hour of sleep is considered a diagnosis of obstructive sleep apnea.
Self-Reported Sleepiness Surveys
Simple sleepiness surveys may be useful for obtaining driver self-assessment of sleepiness status. Examples of sleepiness surveys include:
  • Epworth sleepiness scale.
  • Stanford sleepiness scale.
  • Functional outcomes of sleep questionnaire.
NOTE: Self-reported sleepiness does NOT always correlate with objective testing (polysomnography). The driver may not perceive sleepiness as excessive or may be hesitant to disclose sleepiness.
The complete text of the medical conference reports can be accessed from FMCSA Medical Reports

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