Gary Name Meaning & Origin. Gary. Origin of the name Gary: From the Old English Garwig (spear of battle), a compound name composed from the elements gar (a spear) and wig (battle). Alternatively, Gary developed as a pet form of any of the various names beginning with the Germanic element gar (spear). Var: Garry.
So if you require 3 liters per minute of oxygen, that amount of oxygen is delivered to you throughout one minute whether you take 20 breaths each minute or 10. Continuous flow oxygen concentrators deliver a set amount of oxygen per minute when set to the corresponding setting.
How to Measure Blood Oxygen. Pulse oximetry and arterial blood gas tests are methods to measure how much oxygen is in your blood. Normal oxygen saturation levels range from 97% to 99% in healthy people. When your blood oxygen is too low, it's called hypoxemia.