Elevations of carboxyhemoglobin and methemoglobin can cause falsely elevated oximeter saturation readings.
Henig
H B
HB
D002263:Carboxyhemoglobin / Q000032:analysis*; D006801:Humans; D008706:Methemoglobin / Q000032:analysis*; D010092:Oximetry; D015203:Reproducibility of Results
D008706:Methemoglobin; D002263:Carboxyhemoglobin