Home oxygen is prescribed for low blood oxygen, not simply because someone has COPD or feels breathless. The decision depends on a clinical assessment, the circumstances of the measurements and the person’s wider treatment plan. A single home pulse-oximeter reading is not enough to choose a machine or set a flow.
Who may benefit
The American Thoracic Society guideline recommends long-term oxygen for at least 15 hours a day in adults with COPD and severe chronic resting hypoxaemia. It suggests against routinely prescribing long-term oxygen for moderate chronic resting hypoxaemia, and conditionally supports ambulatory oxygen for severe exertional hypoxaemia.
Those are recommendations for defined groups, not instructions to diagnose yourself from an online threshold. Your clinician decides whether you meet the criteria, whether blood-gas testing or other assessment is needed, and which treatment is appropriate.
Ask for a complete written plan
The prescription should make the practical details clear: the oxygen source, delivery interface, flow or device setting, hours of use and any different instructions for rest, activity or sleep. If monitoring is requested, ask what to record and what results or symptoms should trigger a call.
Some people need a personalised saturation target because excess oxygen can also be harmful in particular circumstances. Do not raise the flow to chase a higher display number, or reduce it because a reading looks reassuring. Follow any individual adjustment plan exactly and ask for clarification when it is ambiguous.
Match the equipment to that plan
Check that the proposed concentrator can deliver the prescribed continuous flow and stated concentration under its operating conditions. A pulse-dose number on a portable device is not equivalent to the same number of litres per minute from a stationary unit. Assessment with the intended equipment matters.
Ask for a demonstration of the cannula or mask, alarms, cleaning and backup supply. Keep the clinical contact separate from the equipment service contact: one addresses treatment and symptoms, the other device performance and faults.
Review after a change in health
Oxygen started during or after an acute illness may need reassessment as recovery progresses. Arrange the follow-up recommended at discharge, even if the equipment is working well. Do not continue, stop or alter treatment solely because the original illness feels better.
Bring the prescription, any requested reading log and a description of difficulties using the equipment to review. Note whether concerns occur during walking, sleep or quiet rest. Serious or worsening breathing difficulty, chest pain, confusion or unusual drowsiness requires urgent medical help rather than waiting for a routine review.
Smoking, vaping and ignition sources must be kept away from oxygen. A clear household safety and backup plan is part of making prescribed treatment workable at home.