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How can the oxygen saturation be more than 100%?

Readings above 100% do not make a physiological sense but the reason for them is that the device is only capable of delivering ”relative” results but not absolute measurements of oxygen saturation. The calibration procedure is described in the manual and the calibration is set so that mean saturation for arterioles in young healthy individuals should be close to 92.2% and mean saturation for venules close to 57.9%. Do not worry much about occasional >100% in individual vessel values for individual cases if the mean is “normal”.

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