How does someone with COPD know if their oxygen therapy is “working” for them? 

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Is your oxygen therapy helping your COPD? Dr. Jerry Krishnan of the University of Illinois of Chicago explains how you can tell and why shortness of breath doesn't tell the whole story. He explains the two main ways to measure the amount of oxygen in your blood (pulse oximeter and arterial blood gas), how skin color can affect the results, and which gives the most accurate results. Dr. Krishnan explains where to place a pulse oximeter on your body and why an arterial blood gas test is the gold standard to determine whether your oxygen level is low.