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<span style="color:#FF0000">This article is a [[stub]]. You can help the '''Apnea Board Wiki''' by expanding it with additional information and sections. For help on the proper way to edit a wiki page, go to the [[Apnea Board Editor Guide]].
'''Pulse oximetry''' is a non-invasive method allowing the monitoring of the oxygenation of a patient's hemoglobin.
A sensor is placed on a thin part of the patient's body, usually a fingertip or earlobe, or in the case of an infant, across a foot. Light of two different wavelengths is passed through the patient to a photodetector. The changing absorbance at each of the wavelengths is measured, allowing determination of the absorbances due to the pulsing arterial blood alone, excluding venous blood, skin, bone, muscle, fat, and (in most cases) fingernail polish.
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