As the the title suggests, how is it that a little light they put on our finger when at the doctors/hospital/etc.. is able to tell us our blood oxygen levels?
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if anyone wants to get into the specific principles on how it works, this video explains it (to the level of postgraduate critical care specialist exams)
Additionally, there are co-oximeters that test more wavelengths of light, which can help distinguish methaemoglobin etc
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