The three most important are: 1  SaO2. Itâs a percentage that shows how saturated your arterial blood is with oxygen. 2  PaO2. Itâs the partial pressure of arterial oxygen. . 3  Itâs the same as SaO2, although itâs estimated by pulse oximetry. A normal value is 95-98%, although 90% or better is usually considered acceptable.
A peak flow meter is a portable, inexpensive, hand-held device used to measure how air flows from your lungs in one âfast blast.â In other words, the meter measures your ability to push air out of your lungs.
Action Set. If you have never used a peak flow meter, talk with your doctor about how to use it correctly, and then practice using it. Measure your peak expiratory flow (PEF) regularly, even if you are feeling good. PEF is lowest in the early morning and highest in the afternoon.