This method does not require a thin section of the person's body and is therefore well suited to a universal application such as the feet, forehead, and chest, but it also has some limitations. Reflectance pulse oximetry is a less common alternative to transmissive pulse oximetry. It measures the changing absorbance at each of the wavelengths, allowing it to determine the absorbances due to the pulsing arterial blood alone, excluding venous blood, skin, bone, muscle, fat, and, in most cases, nail polish. The device passes two wavelengths of light through the body part to a photodetector. Fingertips and earlobes have higher blood flow rates than other tissues, which facilitates heat transfer. In this approach, a sensor device is placed on a thin part of the patient's body, usually a fingertip or earlobe, or an infant's foot. The most common approach is transmissive pulse oximetry. But the two are correlated well enough that the safe, convenient, noninvasive, inexpensive pulse oximetry method is valuable for measuring oxygen saturation in clinical use. Peripheral oxygen saturation (Sp O 2) readings are typically within 2% accuracy (within 4% accuracy in 95% of cases) of the more accurate (and invasive) reading of arterial oxygen saturation (Sa O 2) from arterial blood gas analysis. Pulse oximetry is a noninvasive method for monitoring a person's blood oxygen saturation.
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