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 meters are very helpful if you or your child have moderate to severe asthma and require daily asthma medications. Even most children ages 6 and up should be able to use a peak flow meter with good results.easuring your peak flow using this meter is an important part of managing your asthma symptoms and preventing an asthma attack. The peak flow meter works by measuring how fast air comes out of the lungs when you exhale forcefully after inhaling fully.