Eli5: How the finger light thing can tell how much oxygen is in your blood?

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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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Anonymous 0 Comments

The questions already been answering so I’m going to chuck in a fun fact. Because when CO binds to your blood it creates the same colour as O2, if someone has CO poisoning the device will read their blood oxygen content as being normal.

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