Why It Is Done

Long-term oxygen therapy is used for COPD if you have low levels of oxygen in your blood (hypoxia). It is used mostly to slow or prevent right-sided heart failure. It can help you live longer.

Oxygen may be given in a hospital if you have a rapid, sometimes sudden, increased shortness of breath (COPD exacerbation). Oxygen can also be used at home if the oxygen level in your blood is too low for long periods.

Long-term oxygen therapy should be used for at least 15 hours a day with as few interruptions as possible. Regular use can reduce the risk of death from low oxygen levels.^{footnote 1} To get the most benefit from oxygen, you use it 24 hours a day.

Your need for oxygen depends on your health status and the results of oximetry or an arterial blood gas test.

You may need oxygen in certain situations, including:

• During exercise. For some people with COPD, blood oxygen levels drop only when they exercise or are very active. Using oxygen during exercise may help boost performance and reduce shortness of breath for some people. But there are no studies that show any long-term benefits from using oxygen during exercise.
• During sleep. During sleep, breathing naturally slows down because the body doesn’t need as much oxygen. Sleep-related breathing disorders are quite common in people with COPD, and many will have significantly low blood oxygen levels during sleep.
• For air travel. The level of oxygen in airplanes is about the same as the oxygen level at an elevation of 8000 ft (2400 m). This drop in oxygen can really affect people with COPD. If you normally use oxygen or have borderline-low oxygen levels in your blood, you may need oxygen when you fly. Traveling with oxygen usually is possible. But it is important to plan ahead before you travel.