Using a CPAP machine at night can feel very different from simply sleeping without equipment. You may already have a mask, tubing, humidifier, and CPAP machine beside your bed. If you also need additional oxygen during sleep, adding an oxygen concentrator creates another part of the nighttime setup.
The important thing to understand is that CPAP and an oxygen concentrator do different jobs.
CPAP delivers pressurized air through a mask to help keep the airway open during sleep. An oxygen concentrator, meanwhile, produces oxygen-rich air from room air and can provide supplemental oxygen when it is part of an individual's nighttime oxygen plan. (NHLBI, NIH)
In some situations, the two systems can be used together. Oxygen may be introduced into the CPAP circuit using an appropriate oxygen tubing adapter or connector.
But combining the two devices isn't simply a matter of connecting any oxygen concentrator to any CPAP machine. The equipment, connection method, oxygen flow, CPAP settings, and nighttime requirements all matter.
What Does CPAP Do?
CPAP stands for Continuous Positive Airway Pressure.
A CPAP machine pushes air through a tube and mask while you sleep. The continuous pressure helps keep the upper airway open, which can reduce repeated airway blockages associated with obstructive sleep apnea. (NHLBI, NIH)
A typical CPAP setup includes:
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CPAP machine
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Air tubing
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Nasal or full-face mask
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Mask straps
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Optional humidifier
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Power supply
The CPAP machine is primarily concerned with airway pressure and airflow, rather than producing supplemental oxygen.
What Does an Oxygen Concentrator Do?
An oxygen concentrator works differently.
Instead of using a compressed oxygen cylinder, a concentrator takes in room air and separates gases to provide an oxygen-enriched output.
Depending on the model, an oxygen concentrator may provide:
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Continuous-flow oxygen
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Pulse-flow oxygen
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Adjustable oxygen output
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Battery operation
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AC power
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DC car charging
For nighttime use alongside CPAP, the most important consideration isn't simply choosing the smallest concentrator. You need to make sure the device and connection method are appropriate for the intended setup.
Can You Use a CPAP Machine and Oxygen Concentrator Together?
Yes, CPAP and supplemental oxygen can be used together in some situations, but this combination should be set up with guidance from a qualified healthcare professional.
A healthcare professional can help determine whether supplemental oxygen is appropriate, which oxygen delivery method is suitable, and how the oxygen concentrator should be connected to the CPAP or BiPAP system.
The two systems generally work in different ways:
| Equipment |
Main Function |
| CPAP |
Provides positive airway pressure to help keep the airway open |
| Oxygen concentrator |
Produces oxygen-enriched air |
| CPAP + oxygen |
Combines airway pressure with supplemental oxygen when appropriate |
This distinction is important because oxygen does not replace CPAP for obstructive sleep apnea. Likewise, CPAP does not automatically replace the need for supplemental oxygen when additional oxygen is required.
How Is Oxygen Connected to a CPAP Machine?
A common approach is to introduce oxygen into the PAP tubing using a compatible oxygen adapter or T-connector.
Clinical guidance from the American Academy of Sleep Medicine describes introducing supplemental oxygen into the PAP circuit near the PAP device rather than directly into the mask, because this can provide more consistent mixing. (AASM)
A simplified setup looks like this:
Oxygen Concentrator → Oxygen Tubing → Compatible Connector → CPAP Tubing → Mask
However, the exact connection depends on the CPAP machine, oxygen equipment, tubing, and accessories being used.
Important:
Do not connect an oxygen concentrator to a CPAP system simply because the tubing physically fits.
Check the instructions for both devices and use an appropriate connector. If you are unsure whether a particular concentrator can be integrated with your CPAP setup, confirm compatibility with the equipment manufacturer or your healthcare professional.
CPAP vs. Oxygen Concentrator: What's the Difference?
It is easy to think of CPAP and an oxygen concentrator as doing the same thing because both are used during sleep.
They aren't.
CPAP focuses on airway pressure
CPAP provides continuous positive pressure that helps prevent the upper airway from collapsing during sleep.
Oxygen concentrators focus on oxygen delivery
An oxygen concentrator provides supplemental oxygen through its outlet.
Why the difference matters
Someone can use CPAP successfully while still having a need for additional oxygen. Conversely, adding oxygen does not necessarily address the airway blockage that CPAP is designed to manage.
This is why the two devices should be viewed as complementary equipment rather than interchangeable equipment.
What Type of Oxygen Concentrator Works With CPAP?
There isn't one universal concentrator that is automatically suitable for every CPAP setup.
Several factors need to be considered.
Continuous Flow vs. Pulse Flow With CPAP
The oxygen delivery method is an important consideration when combining an oxygen concentrator with CPAP or BiPAP.
Continuous flow delivers oxygen continuously through the oxygen tubing and is generally preferred when supplemental oxygen is introduced into a CPAP/BiPAP circuit.
Pulse flow delivers oxygen in pulses based on detected breathing. Because breathing patterns can change during sleep, pulse-flow oxygen concentrators should not be assumed to be suitable for use with CPAP or BiPAP.
Which VARON Oxygen Concentrators Should You Consider?
VARON has both portable and home oxygen concentrators, but the correct choice depends on how the equipment is intended to be used.
For a home bedside setup
A stationary continuous-flow model may be worth considering when the priority is having an AC-powered concentrator beside the bed.
Serene 5
Serene 3
- Continuous flow: 1–10 L/min
- Oxygen concentration: 93% ± 3% at 1–3 L/min
- Up to 80% ± 3% at 4–10 L/min
- Weight: 26 lbs
- Nebulizer and humidification
- LCD screen
- Caster wheels
- Programmable timer
- AC powered
The Serene 3 provides continuous flow in a stationary home design. Its smaller weight compared with the Serene 5 may make it easier to move around the home when needed.
CPAP With Oxygen: What Should You Check Before Using Both?
Before putting together a nighttime setup, consider these points.
1. Confirm the oxygen requirement
Don't choose an oxygen flow rate simply because a concentrator offers it.
The appropriate oxygen flow depends on the individual's situation and should be established with a healthcare professional.
2. Check CPAP compatibility
Review the CPAP manufacturer's instructions for supplemental oxygen use.
3. Use the correct connector
A compatible oxygen adapter or T-connector may be required.
4. Consider oxygen delivery type
Check whether the concentrator provides:
Don't assume that every oxygen concentrator works with CPAP.
5. Consider noise
The bedroom environment is different from a living room.
A device operating beside the bed should be comfortable for the sleeper and anyone sharing the room. Compare the manufacturer's actual noise specification rather than assuming a smaller device is automatically quieter.
6. Plan for power
A CPAP machine and oxygen concentrator may both require electricity.
Think about:
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Wall outlet availability
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Power cords
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Battery capacity
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Charging time
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Backup power
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Cable placement
What About Using a Portable Oxygen Concentrator at Night?
Portability can be useful when oxygen equipment needs to move around the home. However, when an oxygen concentrator is being used together with a CPAP or BiPAP machine, delivery method should be considered before portability.
A lightweight portable oxygen concentrator is not automatically suitable for connection to a CPAP system. In particular, pulse-flow portable models should not be presented as recommended options for CPAP/BiPAP use.
For a CPAP + oxygen setup, continuous-flow oxygen is generally preferred. The specific oxygen concentrator, flow setting, connection method, and CPAP/BiPAP setup should be confirmed with a qualified healthcare professional before use.
What to Check Before Choosing an Oxygen Concentrator for CPAP
| Factor |
Why It Matters |
| Oxygen delivery method |
Continuous flow is generally preferred when supplemental oxygen is combined with CPAP/BiPAP. |
| Flow range |
The concentrator should provide the continuous-flow range appropriate for the intended setup. |
| CPAP/BiPAP compatibility |
Check the instructions for both devices before connecting them. |
| Connector compatibility |
An appropriate oxygen adapter or connector may be required to introduce oxygen into the PAP circuit. |
| Noise level |
Important because the equipment may operate throughout the night in the bedroom. |
| Power options |
AC power is important for a bedside setup; battery backup may provide additional flexibility during power interruptions. |
| Battery |
Relevant if the equipment needs to operate away from mains power. |
| Maintenance |
Filters, tubing, and other components should be maintained according to the manufacturers' instructions. |
CPAP With Oxygen: A Simple Nighttime Setup Checklist
Before going to bed:
1. Position the equipment
Place the CPAP and oxygen concentrator on a stable surface with adequate ventilation.
2. Check the tubing
Make sure tubing isn't kinked, crushed, or blocked.
3. Check the mask
Make sure the mask is positioned comfortably and has a good seal.
4. Check the oxygen connection
If using supplemental oxygen with CPAP, verify that the connector and tubing are correctly installed.
5. Check power
Make sure both devices are connected to reliable power.
6. Keep airflow paths clear
Don't cover the concentrator's air intake or ventilation openings.
7. Follow the equipment instructions
Use the CPAP settings and oxygen settings established for your individual setup.
Can Oxygen Replace CPAP?
No.
CPAP and supplemental oxygen serve different purposes.
CPAP is designed to provide positive airway pressure and help keep the airway open during sleep. Supplemental oxygen provides additional oxygen.
For obstructive sleep apnea, oxygen by itself does not provide the same airway-support function as CPAP. (NHLBI, NIH)
If someone is already using CPAP and is considering adding oxygen, the two therapies should be evaluated together rather than simply replacing one with the other.
What If CPAP Alone Isn't Keeping Oxygen Levels Where They Need to Be?
This is an important situation to discuss with a healthcare professional.
Sometimes oxygen may be added to PAP therapy when oxygen levels remain low under certain circumstances. Clinical PAP titration guidance includes supplemental oxygen as an option when specific oxygen-level criteria are met.
The important point is that adding more oxygen isn't necessarily the first or only solution.
The overall setup may need to be reviewed, including:
Don't independently increase oxygen flow or change CPAP pressure without appropriate guidance.
When moving around the home
A lighter device can be easier to move between:
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Bedroom
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Living room
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Home office
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Family room
Battery-powered options can provide additional flexibility, depending on their delivery method and intended use.
Common Mistakes When Combining CPAP and Oxygen
Mistake 1: Assuming oxygen replaces CPAP
It doesn't perform the same function.
Mistake 2: Choosing a concentrator only because it's lightweight
Weight matters, but delivery method and compatibility matter too.
Mistake 3: Connecting tubing without checking compatibility
Use the appropriate connector and follow the equipment instructions.
Mistake 4: Increasing oxygen flow on your own
More oxygen isn't automatically better. Oxygen flow should match the individual's established requirements.
Mistake 5: Ignoring CPAP mask leaks
Air leaks can affect how the CPAP system performs and may also affect the oxygen concentration reaching the user when supplemental oxygen is introduced into the circuit. (AASM)
Mistake 6: Forgetting power planning
Two devices can mean two power requirements. Make sure your nighttime setup has a reliable power source.
FAQs
Can You Use a CPAP Machine With an Oxygen Concentrator?
Yes, CPAP and supplemental oxygen can sometimes be used together, but this combination should be set up with guidance from a qualified healthcare professional.
Does an oxygen concentrator replace a CPAP machine?
No. CPAP provides positive airway pressure to help keep the airway open, while an oxygen concentrator provides supplemental oxygen.
Can I connect any oxygen concentrator to my CPAP?
No. Compatibility, oxygen delivery method, connection equipment, and the CPAP manufacturer's instructions should all be checked first.
Is Continuous Flow Better Than Pulse Flow for CPAP?
Generally, continuous flow is preferred when supplemental oxygen is used with CPAP or BiPAP. Pulse-flow concentrators deliver oxygen based on detected breathing patterns, which may not provide reliable delivery during sleep, particularly with shallow or irregular breathing.
Should the oxygen tubing connect directly to the CPAP mask?
Typically, supplemental oxygen is introduced into the PAP circuit using an appropriate connector rather than simply inserting tubing into the mask. AASM guidance describes introducing oxygen near the PAP device using a T-connector. (AASM)
Can I change my CPAP pressure after adding oxygen?
Don't change CPAP pressure simply because you added an oxygen concentrator. Any adjustment should be discussed with the professional managing your CPAP setup.
Final Thoughts
Using CPAP with oxygen can involve two different technologies working within the same nighttime setup.
CPAP provides positive airway pressure to help keep the airway open, while an oxygen concentrator provides supplemental oxygen when additional oxygen is appropriate. Understanding this difference makes it easier to evaluate equipment, connections, power requirements, noise, and nighttime comfort.
For a home setup, continuous-flow equipment may be considered when that delivery method is appropriate. For portability, lighter battery-powered concentrators can offer greater flexibility, but portability should never be the only selection factor.
Before combining equipment, confirm the compatibility of the CPAP machine, oxygen concentrator, tubing, and connector, and use the oxygen flow and CPAP settings appropriate for your individual needs.
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