[FtrPilot]

If you don't already have one, buy a pulse oximeter. You should monitor your oxygen saturation level multiple times per day. If your oxygen level drops below 90%, you should seek medical care.

You should also monitor your heart rate.

[LTC.Ret]

You are 100% right -— and what I was getting ready to post. Repeating for the benefit of everyone:

“If you don’t already have one, buy a pulse oximeter. You should monitor your oxygen saturation level multiple times per day. If your oxygen level drops below 90%, you should seek medical care.

You should also monitor your heart rate.”