Everyone should have a pulse oximeter as part of their home medical kit. Goes hand and hand with blood pressure and thermometers.
Your PCP will appreciate if you have those vitals available during the initial phone consult.
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I agree with this. We bought one when my Dad came to live with us after his stroke. Eventually, he was put on oxygen, and it was very useful-there’s a reason why they check your blood pressure and oxygen levels when you are in the hospital-and it was very helpful for the providers to have that info.