Which of the following techniques allows a pulse oximeter to determine the amount of hemoglo-bin in a blood sample?
a. Tonometry c. Fluorescent tech-nology
b. Spectrophotometry d. Optical plethys-mography
ANS: B
Pulse oximeters use spectrophotometry to determine the amount of hemoglobin in a blood sam-ple. They use optical plethysmography to estimate the heart rate by measuring cyclic changes in light transmission through the sample site during each cardiac cycle.
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