Overnight pulse oximetry is used primarily as an efficient tool to asses the effectiveness of positive airway pressure (PAP) therapy after beginning treatment. This simple test saves time and money verses having a repeat sleep study.

PAP users who have sleep apnea AND co-conditions such as congestive heart failure (CHF), chronic obstructive pulmonary disorder (COPD), or obesity hypoventilation syndrome (OHS) may need to re-asses the stability of their blood oxygen levels at night once their apneas are controlled.

If overnight oximetry data shows continued low oxygen while on PAP therapy, patients will often be prescribed supplemental O2 to be added to their CPAP or BIPAP circuit.

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