How do pulse oximeters guess the oxygen level in your blood?
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As an additional note, the common pulse ox cannot well distinguish between hemoglobin that is carrying oxygen and that which is carrying carbon monoxide (gas given off from incomplete combustion). So, such a device would not change its reading as you experience carbon monoxide poisoning. I think there is a version of this technology which can tell the difference, but the need is relatively unusual and so I don’t believe it is commonly implemented in the “every day” ones you might expect to encounter. I also don’t know much of anything about them.
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