What is ambulatory oxygen?

Portable oxygen used while you are moving around — out of the house, walking, shopping or socialising. For some people, oxygen is fine at rest but drops during activity, and oxygen on exertion helps them do more. It is prescribed for those who qualify, to keep you active and mobile.

Do I need a test for portable oxygen?

Yes — ambulatory oxygen is assessed, usually with a walking test where you walk with and without oxygen while your level is monitored, so the team can see whether it drops on exertion and whether portable oxygen helps. It is prescribed, not self-started.

How do I know my portable oxygen will last the trip?

Know how long your supply lasts — a cylinder gives a set number of hours depending on flow, and a POC lasts as long as its battery. Take more than you think you will need in case of delays, and re-order cylinders or carry spare charged batteries in good time.

How should I transport oxygen in the car?

Secure the cylinder (for example with a seat belt or in the boot), keep a window open for ventilation, and never leave oxygen in a hot car or direct sunlight. Keep it out of sight if you leave the vehicle, and tell your car insurer you carry oxygen.

Portable & Ambulatory Oxygen: Getting Out

Q: Can portable oxygen help me stay active?

Yes — it can help you keep up daily activities, stay social and take part in pulmonary rehabilitation, the supervised exercise and education programme for lung conditions. Staying active is good for body and mind; your team can advise how to build it back in.

Written & reviewed by the BestDoctors.sg editorial team · Last updated 28 Aug 2026 · General information, not medical advice

Home oxygen does not have to keep you at home. Portable, ambulatory oxygen lets many people get out, shop, socialise and stay active, using a portable cylinder or a small concentrator carried on a strap, trolley or backpack. With a little planning around how long the supply lasts, going out becomes routine again. This guide explains ambulatory oxygen, how it is assessed, and how to use it confidently away from home.

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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.

This is general information and does not replace your team’s advice. Ambulatory oxygen is assessed and prescribed — do not start it yourself — and never change your own flow rate. Keep cylinders and portable units upright and secure, and never leave them in a hot car. Call 995 for severe breathlessness, blue lips, or new drowsiness.

What ambulatory oxygen is

Ambulatory oxygen is portable oxygen used while you are moving around — out of the house, on a walk, shopping or socialising. For some people, the blood oxygen level is fine at rest but falls significantly during activity, and oxygen used on exertion helps them do more. It is not the same as the main home supply for long-term oxygen; it is specifically about keeping you active and mobile, and it is prescribed for those who qualify.

Assessed with a walk test

Ambulatory oxygen is assessed, not self-started. Getting it usually involves a walking test, where you walk with and without oxygen while your oxygen level is monitored, so the team can see whether your level drops on exertion and whether portable oxygen helps. The team also considers your lifestyle and how active you are. This makes sure portable oxygen is genuinely helping and set at the right level for you, rather than assumed.

Portable cylinders and concentrators

Ambulatory oxygen usually uses either a portable cylinder of compressed oxygen or a portable oxygen concentrator (POC). Portable cylinders are relatively light and fit in a small backpack or shopping trolley, but hold a finite amount that runs down. A POC runs on a rechargeable battery and makes oxygen from the air, so it does not empty like a cylinder — but the battery does need charging. Your team and supplier advise which suits your needs and how far each will get you. Many people end up with a cylinder for shorter outings and a concentrator for longer days, and your supplier can help you work out the best mix.

Planning how long it lasts

The key to going out confidently is knowing how long your supply lasts and planning around it. A portable cylinder gives a certain number of hours depending on the flow, and a POC lasts as long as its battery charge. A sensible rule is to take more oxygen than you think you will need, in case of delays, and to re-order cylinders or recharge and carry spare batteries in good time. A little planning means you are never caught short away from home, and it quickly becomes second nature to check your levels before heading out, just as you would check your keys and wallet.

Carrying and transporting it

Portable oxygen comes with ways to carry it — a shoulder bag, backpack or wheeled trolley — so you are not lifting weight. Keep cylinders and POCs upright and secure so they do not roll around or fall. Carry your oxygen prescription or a letter from your team, which is useful on public transport, in taxis and when travelling. Knowing how to switch a portable cylinder on and off, and how to read the battery or gauge, makes it all feel routine.

In the car

When travelling by car, secure the cylinder — for example with a seat belt or in the boot — and keep the vehicle ventilated with a window open. Never leave oxygen in a hot car or in direct sunlight, as heat build-up is a hazard, and keep it out of sight if you leave the vehicle. It is worth telling your car insurer that you carry oxygen. These simple steps keep car journeys safe and straightforward.

Staying active and getting out

Ambulatory oxygen is about living, not just managing — it can help you keep up daily activities, stay social and take part in pulmonary rehabilitation, the supervised exercise and education programme that helps people with lung conditions do more with less breathlessness. Staying active is good for body and mind, and doing a little more each week builds both strength and confidence over time, so you gradually widen what feels possible and get more out of each day. Your oxygen supplier handles refills and deliveries and can help you plan trips, and in Singapore your respiratory team can advise how to build activity back into your life with portable oxygen.

Sources

Asthma + Lung UK — Living with home oxygen: asthmaandlung.org.uk
Asthma + Lung UK — How is home oxygen delivered: asthmaandlung.org.uk
Baywater Healthcare — Away from home with oxygen: baywater.co.uk
NHS — Home oxygen treatment: nhs.uk

General information only. This guide supports — but does not replace — the advice of your respiratory team and oxygen supplier, who set your oxygen and tailor it to you. Never change your own oxygen flow rate, and never smoke or allow naked flames near oxygen. Oxygen is prescribed for low blood oxygen, not to relieve breathlessness on its own. Call 995 if breathing becomes severe or does not ease as usual, if the lips or fingertips turn blue, for chest pain, or if the person becomes unusually drowsy, confused or hard to wake (a possible build-up of carbon dioxide from too much oxygen). If you are struggling emotionally, you are not alone — the Samaritans of Singapore (SOS) are on 1767 and mindline.sg on 1771.

Portable & Ambulatory Oxygen (Singapore)