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Uptodate Reference Title
Effect of carboxyhemoglobin on measured oxygen saturation by pulse oximetry
Effect of carboxyhemoglobin on measured oxygen saturation by pulse oximetry
SpO2 and cooximetry versus carboxyhemoglobin (COHb) at FiO2 = 1.0. SpO2 consistently overestimates O2 saturation in the presence of COHb. At COHb = 70 percent, SpO2 is still roughly 90 percent, while oxyhemoglobin has fallen to 30 percent.
FiO2: fraction of inspired oxygen; O2: oxygen; SpO2: standard pulse oximetry.
