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How does a Pulse Oximeter Work?
Pulse Oximetry is a test carried out using a Pulse Oximeter. This test is used to measure the oxygen level in our blood.
Pulse Oximetry is based on the principle that Oxygenated Hemoglobin and Deoxygenated Hemoglobin differentially absorb red and infrared light.
Hemoglobin is a protein present inside our red blood cells, it transports oxygen from lungs to cells in our body.
Oxygenated Hemoglobin absorbs greater amounts of infrared light and lower amounts of red light as compared to Deoxygenated Hemoglobin.
Now, a Pulse Oximeter has LEDs which emit red as well as infrared light. These lights pass through our finger and are detected by a photodiode on the opposite side.
Finally, by measuring changes in the light absorption a Pulse Oximeter is able to give us the Oxygen level in our blood.

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