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Principles of Pulse Oximetry

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Principles of Pulse Oximetry
By Diego Dumani, Georgia Tech, Georgia, USA 

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How can you measure oxygen in your body? Pulse oximetry allows to quantify blood oxygen saturation through the use of two diodes emitting red light and infrared. The variations in absorption of these two "colors" by blood in your finger indicate the degree of oxygen binding to hemoglobin, known as oxygen saturation.