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Pulse Oximeter
Last Updated: 10/09/2008
The Pulse Oximeter calculates how much oxygen is carried in your blood.  It's based on measuring the difference between levels of the red pigment hemoglobin which carries oxygen in your blood. The Pulse Oximeter has two light-emitting diodes - one that sends out invisible infrared light and one that sends out red light. The exact colors are chosen to coincide with the maximum differences in colors of light absorbed by each form of hemoglobin. The difference between the two gives a measure of what fraction of the hemoglobin in your blood is oxygenated and thus how much oxygen is being carried around inside you.

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