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Not exactly wearable, but I have learned in the midst of all this that fingertip pulse oximeters cost only $20-40 retail. Has there been any work to see if falling oxygenation readings can serve as a precurser? In any event I have started charting my own oximeter readings along with my temperature, both for baselines. It looks like I should add pulse rate as well.

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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!)

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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