When I had covid in very early 2020 I monitored my blood oxygen levels religiously as it declined precipitously and I became more and more ill. Given it was the

When I had covid in very early 2020 I monitored my blood oxygen levels religiously as it declined precipitously and I became more and more ill. Given it was the first outbreak in seattle I was advised to stay away from the hospital unless it dropped to X, at which point they could provide palliative care as there was no treatment or available ventilators. I got very close to X, and did end up with an extended hospital stay and long covid. So - not how useful the blood ox monitor was but it did provide some form of comfort as I skirted with death to see how close I am.