Long-term oxygen therapy is considered for selected people with COPD who have persistently low oxygen levels after appropriate assessment. Breathlessness alone does not establish the need. Someone can be very breathless for reasons that need other treatment, while another person may have important hypoxaemia without recognising how low their oxygen level is.
What the evidence supports
The GOLD 2026 guidance states that long-term oxygen improves survival in severe chronic resting hypoxaemia. It also distinguishes this from moderate resting or exercise-related desaturation, where routine long-term oxygen has not shown the same benefit. These findings do not justify promising a particular number of extra years to an individual.
The clinical decision considers measurements, stability of the condition and relevant complications. It is not determined by the COPD stage label, the appearance of breathlessness or an equipment salesperson's recommendation.
Why assessment may involve more than an oximeter
The team may measure oxygenation at rest, assess activity and request blood gases when appropriate. Blood testing can provide information that an oximeter cannot, including carbon dioxide. The meaning of a result depends on whether the patient is receiving oxygen and on the clinical circumstances.
Do not stop prescribed oxygen to obtain a “room-air” reading unless the team is supervising or has explicitly instructed it. A home reading near an online eligibility cutoff is not a prescription. The oxygen-measurement guide explains the difference between saturation estimates and arterial blood results.
Separate an acute episode from stable care
Oxygen started during or after an acute illness may need review as the person recovers. Conversely, increasing symptoms should not be attributed to an old diagnosis without assessment. Ask when the prescription will be reassessed and what should prompt earlier contact.
If long-term oxygen is prescribed, clarify the delivery mode, settings, hours of use and instructions for activity and sleep. Ask for a written monitoring and emergency plan. Do not increase flow to chase a universal saturation target or reduce use because symptoms have temporarily improved.
Make the prescribed plan practical
Discuss tubing, mobility, sleep, comfort, electricity and backup before equipment is supplied. If carrying a device or managing the interface makes the plan difficult, tell the team. An equipment or support change may help; quietly using less oxygen does not resolve the underlying problem.
Keep smoking and flames away from oxygen equipment and follow the provider's safety instructions. Ask about smoking-cessation support where relevant. Continue the rest of the COPD treatment plan, including medicines and rehabilitation when prescribed. Oxygen supplements care for an assessed need; it does not replace treatment of an exacerbation. Severe new breathlessness, chest pain, confusion or a supply failure that cannot be managed requires urgent help.