Anne,I never believed in those outpatient, digital, finger testing oxygen devices or most of the portable, digital blood pressure monitors. They're incredibly inaccurate and inconsistent, from ine minute to the next. If some of the readings I got when I was in rehab were real, I'd be dead. Blood oxygen levels of 80 something one minute and 99 the next.
Trust how you feel. It's the best guide.Best,Ira