What are examples of home sleep tests (HSTs) results?

Updated: Sep 24, 2019
  • Author: Wendy M Smith, MD; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Answer

Answer

Sample sleep study results for mild, moderate, and severe OSA are shown in the images below.

Sleep study: Mild obstructive sleep apnea (OSA). O Sleep study: Mild obstructive sleep apnea (OSA). Oxygen saturation is demonstrated with the red tracing and snoring sound levels with the blue tracing. Each hypopneic episode is identified with a blue vertical line. Each apneic episode is identified with a red vertical line. The patient's total sleep time was 7 hours and 4 minutes. The lowest oxygen saturation was 83%. The patient's apnea index was 0.7 events per hour; the hypopnea index was 4.4 events per hour; and the apnea-hypopnea Index was 5.1 events per hour. The impression is mild OSA.
Sleep study: Moderate obstructive sleep apnea (OSA Sleep study: Moderate obstructive sleep apnea (OSA). The patient's total sleep time was 7 hours and 49 minutes. The lowest oxygen saturation was 83%. The patient's apnea index was 4.1 events per hour; the hypopnea index was 20.3 events per hour; and the apnea-hypopnea index was 24.4 events per hour. All of the patient's apneic events are obstructive. Note the increasing number of both apneas and hypopneas in the latter half of the sleep study, which correlates with an increasing time spent in rapid eye movement (REM) sleep. Apneic and hypopneic episodes do not correlate well with snoring sound level. The impression is moderate OSA.
Sleep study: Severe obstructive sleep apnea (OSA). Sleep study: Severe obstructive sleep apnea (OSA). The patient's total sleep time was 4 hours and 27 minutes. The lowest oxygen saturation was < 70%. The patient's apnea index was 82.4 events per hour; the hypopnea index was 4.3 events per hour; and the apnea-hypopnea index was 86.6 events per hour. Note that the apneic events are all obstructive and that they are nearly continuous during the sleep study. The impression is severe OSA.

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