Which of the following actions is indicated when a disparity exists between SpO2, SaO2, and the clinical presentation of a patient?
a. Move the probe to an alternate site to check for SpO2.
b. Replace the pulse oximeter probe.
c. Measure arterial oxygen saturation by CO-oximetry.
d. Disregarding the SaO2.
ANS: C
Laboratory CO-oximeters measure all four types of hemoglobin by using separate wavelengths of light to identify each species, whereas pulse oximeters use only two wavelengths to quantify the amount of O2HB and HHB present.
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