Question

Oxygen saturation is estimated by  _________

(a) ratio (R) of pulse-added red absorbance at 660 nm to the pulse-added infrared absorbances at 940 nm

(b) ratio (R) of pulse-added red absorbance at 940 nm to the pulse-added infrared absorbances at 660 nm

(c) ratio (R) of pulse-added red absorbance at 330 nm to the pulse-added infrared absorbances at 940 nm

(d) ratio (R) of pulse-added red absorbance at 940 nm to the pulse-added infrared absorbances at 330 nm

This question was posed to me in quiz.

My question comes from Electroencephalograph (EEG) in division Biomedical Recorders of Biomedical Instrumentation

Answer 1

Correct choice is (a) ratio (R) of pulse-added red absorbance at 660 nm to the pulse-added infrared absorbances at 940 nm

The explanation is: Oxygen saturation is estimated from the ratio (R) of pulse-added red absorbance at 660 nm to the pulse-added infrared absorbances at 940 nm.