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.
Peak flow: Just one tool for asthma control. Using a peak flow meter can be an effective tool for managing your asthma â but there are other things you need to do: 1  Use an asthma action plan. 2  An action plan is a simple but important part of managing your asthma.eak flow: Just one tool for asthma control. Using a peak flow meter can be an effective tool for managing your asthma â but there are other things you need to do: 1  Use an asthma action plan. 2  An action plan is a simple but important part of managing your asthma.