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Fluctuating oxygen levels

Just wanted to know if anyone out there had any insight.

46 year old male. Been doing FB for 5 years. (Posted here a few times.) 4-5 workouts per week and healthy eating habits. My blood oxygen level is usually between 97% - 99%.

I tested positive for Covid last Monday. Thankfully been feeling pretty good but not enough to exercise. Now my level ranges from 90% - 98% over the course of a reading. The readings are steady for the rest of the family, so not a faulty oxymeter. My doctor said not to be concerned because if it can go high, then it must be fine. But I am still not confident.

Anything would be appreciated.

Thank you!