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a photoelectric device that measures oxygen saturation of the blood by recording the amount of light transmitted or reflected by deoxygenated versus oxygenated hemoglobin.
finger oximeter a pulse oximeter whose sensor is attached to a finger, so that the oxygenation of blood flowing through the finger can be determined. See illustration.
pulse oximeter an oximeter that permits measurement of oxygen saturation in an artery by recording the different modulations of a transmitted beam of light by reduced hemoglobin and oxyhemoglobin as seen during the pulse. A component of the oximeter analyzes the variations in light absorption and provides a readout of the per cent of saturation of the hemoglobin. A saturation above 90 per cent corresponds to a PaO2 of 60 torr or higher. The presence of fetal hemoglobin, carboxyhemoglobin, or intravascular dyes may alter the accuracy of a pulse oximeter. In these instances a SaO2 of 90 per cent may not be associated with a PaO2 of greater than 60 torr.
A device, usually attached to the earlobe or fingertip, that measures the oxygen saturation of arterial blood by sensing and recording capillary pulsations.
pulse oximetry n.
a optical device that measures the amount of oxygen-saturated hemoglobin in the tissue capillaries by transmitting a beam of light through the tissue to a receiver. This noninvasive method of measuring the saturated hemoglobin is a useful screening tool for determining basic respiratory and cardiovascular function. This cliplike device may be used on an earlobe, across the bridge of the nose, in the mouth, on a toe, or on a fingertip. As the amount of saturated hemoglobin alters the wavelengths of the transmitted light, analysis of the received light is translated into a percentage of oxygen saturation (SO2) of the blood. Also called (informally) pulse ox. Compare blood gas determination.
pulse oximeterCritical care A device that measures the difference in the light transmitted by oxygenated and deoxygenated Hb caused by their differences in light absorption within the circulation; the PO takes advantage of these differences and provides an indirect measurement of the arterial Hb O2 saturation
pulse ox·i·me·ter(pŭls oks-im'ĕ-tĕr)
A spectrophotometric device that noninvasively estimates saturation of arterial oxyhemoglobin (SaO2) by use of selected wavelengths of light.