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Finger pulse oximeters can definitely provide useful data, but I suspect that they're lagging indicators for Covid-19, because typically, severe respiratory symptoms that affect blood oxygen levels appear later in the course of the disease. (But my background is in behavioral science, not pulmonology, so I might be wrong!)

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Agreed, but I saw an unverified comment somewhere suggesting someone had a less than <90% reading and was still mobile. I don't know if that is possible, but I mentally filed that next to incidents of people just collapsing on the street. To the extent hemoglobin disorder might??? be involved (per Chris Martenson), there could? be a mechanism for low blood oxygen without lung/respiratory disorder per se.

There's so much we don't know about this disease. Maybe there will be surprising findings.

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