For what?: Are you referring to nighttime pulse oximetry for sleep apnea? As with most screening tests, the predictive value depends, in part, on the pre-test probability of an abnormal result. Nighttime desaturation on home oxymetry is strongly suggestive of sleep apnea but doesn't distinguish between central and obstructive sleep apnea or subclinical seizure d/o & can't dx other parasomnias.
Answered 11/27/2017
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