I am currently in the hospital with my daughter and they are having to periodically check her oxygen levels. To do so they are putting a sensor on her foot. How do these readings work that they can tell something like oxygen levels using that method?
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The pulse oximeter emits light of certain wavelengths which passes through the skin and the blood in an artery. It measures how much light of each wavelength is transmitted, and because oxygenated blood and deoxygenated blood absorb different wavelengths can calculate the percentage of blood that is oxygenated.
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