Home oxygen assessment
An assessment, including blood oxygen tests, to find out whether home oxygen would genuinely help you and, if so, how much and when to use it.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- The assessment decides whether home oxygen would genuinely help you, mainly by measuring the oxygen in your blood.
- Oxygen mostly helps people with persistently low blood oxygen; it does not ease breathlessness if your oxygen levels are normal.
- Blood gas tests may be repeated a few weeks apart when you are stable, so the result is reliable.
- Oxygen is not offered to people who continue to smoke because of the serious fire risk, and safety at home is part of the assessment.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Finds out whether oxygen would genuinely help you, rather than guessing
Oxygen is not a treatment for breathlessness when blood oxygen levels are normal.
Any blood sample site may ache briefly. You can usually go straight home and back to normal activity.
A follow-up blood gas check within a few months of starting oxygen.
Any blood sample site may ache briefly. You can usually go straight home and back to normal activity.
Some results are available the same day, but a final decision often waits for a repeat blood gas test a few weeks...
Equipment is arranged and you are shown how to use it safely, including hours of use and fire safety. It can take...
If you start long-term oxygen, you should have a blood gas check within about three months to confirm it is...
What is a home oxygen assessment?
A home oxygen assessment is a set of checks to find out whether breathing extra oxygen at home would genuinely help you, and if so, how much, when and how to use it. It is an assessment, not an operation.
It matters because home oxygen is a treatment, not a comfort measure. It mainly helps people whose blood oxygen is persistently low, where it can protect the heart and improve survival. It does not relieve breathlessness in people whose oxygen levels are normal, and giving it wrongly can be unhelpful or even harmful.
The assessment usually includes measuring the oxygen in your blood, often with a blood gas test from the wrist or earlobe, sometimes alongside a walking test. The team also checks safety at home, including whether anyone smokes, because oxygen is a serious fire risk.
The result tells you whether you qualify for oxygen, what type would suit you, and how to use it safely. For many people the honest answer is that oxygen would not help, and that other treatments are more useful.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Long-term vs ambulatory oxygen
| Aspect | Long-term (LTOT) | Ambulatory |
|---|---|---|
| Main aim | Protect heart, improve survival | Help you do more when active |
| When used | Many hours a day, including sleep | When out and about or exercising |
| Who it suits | Persistently low blood oxygen | Selected people who drop on activity |
| Equipment | Home concentrator | Portable cylinder or concentrator |
Both are decided by testing, not symptoms alone. Some people qualify for one, both or neither. Oxygen is a treatment for low blood oxygen, not a general remedy for breathlessness.
Preparing for your test
- Do not have the assessment during a flare-up — you should be stable, usually for several weeks, for the result to be reliable.
- Bring all your inhalers and medicines and a list of your conditions.
- Be honest about smoking — yours and anyone in your household — as oxygen cannot be supplied if there is active smoking because of fire risk.
- Wear comfortable shoes in case a walking test is needed.
- Tell the team about previous oxygen use, recent hospital stays and how breathless you get day to day.
- Ask whether the test is at a clinic or at home, and how long it will take.
- Mention if you have cold hands, as this can affect finger and earlobe readings.
What happens
A home oxygen assessment is an appointment with tests, not a procedure you recover from. The team asks about your breathlessness, your condition and your home, and checks your oxygen with a finger clip.
The key test is usually a blood gas measurement. A small blood sample is taken, most often from an artery at the wrist or from a warmed earlobe, to measure oxygen and carbon dioxide accurately. The wrist sample can sting briefly. To be sure the result is reliable, this is often repeated on another visit a few weeks apart when you are stable.
If portable oxygen is being considered, you may do a supervised walking test with and without oxygen to see whether it helps. The team also assesses fire and trip risks at home, including smoking.
At the end, the team explains whether you qualify, what type and flow of oxygen would suit you, how many hours a day to use it, and how to use it safely — or why oxygen would not help and what might be better.
Is this test right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Oxygen is not a treatment for breathlessness when blood oxygen levels are normal.
- People who continue to smoke are not offered home oxygen because of the serious fire risk.
- Assessment during a flare-up is unreliable; the person needs to be clinically stable first.
- Where rising carbon dioxide is a concern, oxygen must be prescribed and monitored very carefully, not started casually.
Delay or rearrange if…
- You have had a recent flare-up or chest infection and are not yet stable.
- You are still smoking or there is active smoking in the household.
- Recent results, such as blood gases when stable, are missing.
- Your treatment has recently changed and needs time to settle.
- Safety issues at home need sorting before oxygen could be supplied.
Alternatives to discuss
- Optimising inhalers and other medicines for the underlying condition.
- Pulmonary rehabilitation to improve fitness and breathlessness.
- Treating other causes of breathlessness, such as heart failure or anaemia.
- Breathing techniques, a handheld fan and pacing for breathlessness with normal oxygen.
- Stop-smoking support, which is also a requirement before oxygen can be considered.
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Finds out whether oxygen would genuinely help you, rather than guessing
- Identifies the people for whom oxygen can protect the heart and improve survival
- Sets the right type, flow and hours so any oxygen is used effectively
- Avoids putting people on oxygen that will not help and could carry risks
- Includes a safety check to reduce fire and trip hazards at home
- Gives clear, honest information so you can make an informed decision
Risks & complications
- Brief stinging or a small bruise from an arterial blood sample at the wrist
- A finding that oxygen would not help, which can be disappointing
- Needing to come back for a repeat blood test to confirm the result
- An inaccurate finger reading, especially with cold hands or darker skin tones, so blood gas testing is used to confirm
- Temporary light-headedness during a walking test
- Difficulty obtaining a clear blood sample, needing a second attempt
- Significant bleeding or nerve irritation at an arterial sample site
- Fainting during testing
- If oxygen is later supplied and used incorrectly, a rise in carbon dioxide in some people, or a serious fire if anyone smokes near it
The assessment itself is low-risk; the bigger issues are around oxygen treatment if it is later supplied. Oxygen is not a treatment for breathlessness with normal oxygen levels, and in some people too much oxygen can cause carbon dioxide to build up. The most serious risk is fire: oxygen must never be used near smoking or naked flames. Ask the team what your blood results show, why oxygen is or is not recommended, and exactly how to use it safely.
Published figures to discuss
Whether someone qualifies for oxygen, and how much it helps, depends on their blood oxygen levels, the cause and severity of their condition and other health problems. Survival benefit from long-term oxygen has only been shown in particular groups with persistently low oxygen who use it for enough hours a day. This guide therefore describes who benefits qualitatively rather than quoting exact rates, and avoids implying oxygen helps everyone who is breathless.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Eligibility for long-term oxygen therapy | NICE flags persistent stable resting oxygen saturation of 92% or less in COPD for LTOT assessment | Qualification is usually based on arterial blood gases and specialist assessment, not a single finger-probe reading. | NICE QS10 — Assessment for long-term oxygen therapynice.org.ukPublished figure |
| Survival benefit | Shown for selected people with severe chronic resting hypoxaemia when oxygen is used for enough hours each day | British Thoracic Society quality standards refer to improved survival with around 15 hours per day use in the right group. | Guide sourcesClinical context |
| Fire and burn risk | Clinically important, especially with smoking or naked flames | Oxygen is not flammable itself but feeds fire. Smoking while using oxygen is a major safety red flag. | BTS guidelines for home oxygen use in adults — PubMedpubmed.ncbi.nlm.nih.govSource-linked context |
| Carbon dioxide retention | Recognised in some COPD and ventilation-risk patients | Oxygen should be prescribed to a target saturation range, especially in people at risk of hypercapnic respiratory failure. | BTS guidelines for home oxygen use in adults — PubMedpubmed.ncbi.nlm.nih.govSource-linked context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is no operation and nothing to recover from. 'Afterwards' here means getting your results, deciding about oxygen, and the ongoing reviews if oxygen is started.
- A brief ache or small bruise where blood was taken
- Feeling tired after a walking test
- Waiting a few weeks for a repeat test before a final decision
- Taking time to adjust to using equipment if oxygen is started
- Sometimes being told oxygen is not needed, which is a valid result
Aftercare
- If oxygen is prescribed, use it for the number of hours advised — for long-term oxygen this is often many hours a day, including overnight.
- Never smoke, vape or allow naked flames near oxygen, and keep it away from cookers and heaters.
- Keep the equipment serviced and know who to call if it fails.
- Attend your follow-up blood gas check and annual reviews.
- Tell your team if you feel more drowsy or confused on oxygen, as this can signal rising carbon dioxide.
- Do not change your oxygen flow rate yourself unless told you can.
- Keep up your other treatments — oxygen works alongside them, not instead of them.
- Confirm whether the assessment is at clinic or home
- Be stable and free of a flare-up before testing
- Bring inhalers, medicines and condition list
- Be ready to discuss smoking honestly
- Comfortable shoes for a possible walking test
- Questions about what your results mean
- Know how repeat tests and reviews will be arranged
⚠ Get urgent help if…
- If you are on oxygen and become very drowsy, confused or hard to wake — seek urgent help
- Severe or sudden worsening breathlessness — call 999 if struggling to breathe
- Blue or grey lips or fingertips
- Chest pain with breathlessness
- Any fire, burn or equipment fault involving the oxygen
- A headache and drowsiness that are new since starting oxygen
- A flare-up that is not improving
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A clear assessment tells you whether oxygen would help, what type, and how to use it — or that oxygen is not the right treatment for you. For people with persistently low blood oxygen, long-term oxygen used for enough hours a day can protect the heart and improve survival.
The assessment cannot make oxygen helpful for people whose levels are normal, and a normal result does not mean nothing is wrong — it means oxygen is not the answer, and other treatments such as inhalers, pulmonary rehabilitation or treating other conditions may help more.
Your oxygen needs can change over time, so the result is not fixed. Long-term oxygen is reviewed at least yearly, with a blood gas check within a few months of starting, and your flow or hours may be adjusted. If your condition improves or stabilises, oxygen may sometimes be reduced or stopped, and if it worsens, more may be needed.
Related tests, treatments or support
Home oxygen assessment usually sits alongside the wider management of your lung or heart condition. It is often considered together with pulmonary rehabilitation, inhaler review, stop-smoking support and treatment of conditions such as heart failure. Oxygen is one part of care, not a substitute for the rest.
Follow-up & long-term care
If oxygen is started, you should have a blood gas check within about three months to confirm it is working safely, then at least annual reviews by the home oxygen service. Reviews check your blood oxygen and carbon dioxide, how you are using the oxygen, safety at home and whether your needs have changed. Your GP and specialist are kept informed.
- Using oxygen for the prescribed hours each day
- Regular servicing of equipment and a fault contact number
- A follow-up blood gas check after starting and at least annual reviews
- Ongoing fire safety, with no smoking near oxygen
- Keeping up inhalers, rehab and other treatments alongside oxygen
Repeat, follow-on and what comes next
- Blood gas tests are often repeated a few weeks apart before a final decision.
- A first reading from a finger clip may be checked against a more accurate blood test.
- Oxygen flow and hours are adjusted at reviews as your needs change.
- Oxygen may be reduced or stopped if it is no longer needed, or increased if your condition worsens.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A follow-up blood gas check within a few months of starting oxygen.
- At least annual review of oxygen needs and home safety.
- Clear, written fire-safety and usage instructions.
- A contact for equipment faults and clinical concerns.
- Joined-up records so your GP and specialist know your oxygen status.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- The type of assessment, including blood gas testing and any walking test
- Whether testing is done at a clinic or at home
- Whether repeat tests are needed to confirm the result
- The specialist staff involved in assessment and review
- The type of oxygen equipment if oxygen is recommended
- Ongoing reviews and equipment servicing
- How the service links with your NHS care and GP
- What tests the assessment includes and whether repeats are covered
- Who carries out and interprets the assessment
- What happens if you qualify, including equipment and who supplies it
- What happens if oxygen is not recommended
- How follow-up blood gas checks and annual reviews are arranged
- Who is responsible for equipment servicing and faults
- How safety, including fire risk, is assessed and managed
On the NHS? Home oxygen assessment is normally provided on the NHS through a specialist service when clinically indicated; using oxygen privately without proper assessment is not recommended because it can be ineffective or unsafe.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Suggesting oxygen will ease breathlessness when oxygen levels are normal.
- Not explaining the fire risk and the smoking rules clearly.
- Not warning that too much oxygen can raise carbon dioxide in some people.
- Starting oxygen without arranging the follow-up blood gas check.
- Not making clear how many hours of use are needed for any benefit.
Marketing red flags
- Selling oxygen concentrators or cylinders directly to patients without assessment.
- 'Oxygen bars' or wellness oxygen promoted as a treatment for lung disease.
- Claims that oxygen will cure or reverse a lung condition.
- No mention of blood gas testing, smoking rules or fire safety.
- Encouraging people to set their own flow rates without medical advice.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- What do my blood oxygen results actually show?
- Would I benefit from long-term oxygen, portable oxygen, both or neither?
- How many hours a day would I need to use it, and why?
- How will you make sure my carbon dioxide does not rise on oxygen?
- What are the fire and safety rules I must follow at home?
- How and how often will my oxygen needs be reviewed?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my test, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this test not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Will oxygen help my breathlessness?
Is the assessment available on the NHS?
Why do I need a blood test, and does it hurt?
Why can't I have oxygen if I smoke?
How many hours a day would I need to use it?
What if the assessment says I don't need oxygen?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NHS — Home oxygen therapy NICE QS10 — Assessment for long-term oxygen therapy British Thoracic Society — Home oxygen quality standards BTS guidelines for home oxygen use in adults — PubMed Asthma + Lung UK — Chronic obstructive pulmonary disease (COPD)
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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