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Yes!
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Replying to @balajis
Here's an example: when Wuhan hospitals filled up, blood oxygen level was the primary tool for triage. Those meters are simple to use and cost $19 on Amazon. Why not keep one at home, so you could ask the cutoff and know whether to go wait in the ER line? Especially for age > 50.
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I don't know why everyone is so down on phone apps for oximetry. Some aren't perfect, but they are accurate enough and you'll get general trends.
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