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The CPAP machine itself does not control your SPO2 or oxygen saturation, so there is no part that controls this. Simplified, SPO2 is the amount of oxygen, expressed as a percent, found in the blood. Your optimal SPO2 is determined during your sleep study. The RT or Polysomnographer that performed your sleep study would adjust your pressure, measured in centimeters of water, to determine what decreases your apnea events while keeping your SPO2 as optimal as possible. This is called titrating. So essentially the oxygen saturation is controlled by the pressure setting that is determined by your physician as your therapeutic level or range.

If by using a pulse ox monitor, you have determined that your SPO2 is dropping while using your CPAP machine, you should discuss these finding with your physician because a new sleep study may be required.

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Q: Which part of cpap controls oxygen saturation?
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