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

Helpful suggestion for any medical-related question like this – ask your doc / nurse / tech / practitioner / etc. next time someone uses one on you just ask and they’ll explain it.

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