How is the percentage of functional hemoglobin that is saturated with oxygen determined via pulse oximetry?
A) The percentage of red light that lands on the photodiode represents the SPo₂ (oxygen saturation as determined by pulse oximetry) .
B) The percentage of infrared light that reaches the photodetector reflects the SPo₂.
C) The ratio of the red and infrared light that reaches the photodiode signifies the SPo₂.
D) The sum of the amount of red and infrared absorbed by the tissue determines the SPo₂.
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