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. Peak flow is the most commonly performed breathing test and is designed to measure the speed you can blow out. The test is very simple and all you have to do is take a very deep breath in and then blow out as fast as you can. Peak flow is often used in the diagnosis of asthma.