Fractional hemoglobin saturation is calculated from values measured by which of the following?
a. Pulse oximeter c. Clark electrode
b. CO-oximeter d. Severinghaus elec-trode
ANS: B
The fractional hemoglobin saturation is calculated by dividing the amount of O2Hb by the sum of HHb + O2Hb + HbCO + metHb. All four hemoglobin can be measured by a CO-oximeter. A pulse oximeter noninvasively measures oxygen saturation and heart rate only. A Clark electrode measures only the PO2, and a Severinghaus electrode measures the PCO2.
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