APAP vs CPAP is a comparison of two machines that deliver prescribed air pressure through a mask but respond to breathing differently. A CPAP machine provides one set pressure, while an APAP machine—also called an auto-adjusting CPAP—can adjust pressure within a range prescribed by a healthcare professional.
However, neither type is right for everyone. The appropriate device depends on the prescription, clinical circumstances, and equipment requirements. Therefore, this guide explains the main differences and practical questions to discuss with the prescribing healthcare professional or equipment supplier.
APAP vs CPAP: What is a CPAP machine?
CPAP stands for continuous positive airway pressure. A CPAP machine delivers air at one prescribed pressure during use. Meanwhile, the machine, tubing, and mask work together as a system: the mask connects to the machine through the tubing and provides the interface for airflow.
The prescribing professional sets the pressure as part of the therapy plan. Therefore, users should not change that setting unless their healthcare professional directs them to do so.
APAP vs CPAP: What is an APAP machine?
APAP stands for automatic positive airway pressure. Unlike a CPAP machine, an APAP machine can adjust delivered pressure within a prescribed range in response to breathing signals the device detects.
A healthcare professional establishes the permitted pressure range and other settings. In other words, an APAP machine does not prescribe its own therapy: automatic adjustments do not replace a professional’s evaluation or decisions about treatment.
APAP vs CPAP: Key differences
| Feature | CPAP | APAP |
|---|---|---|
| Pressure delivery | Delivers one prescribed pressure | Adjusts pressure within a prescribed range |
| Settings | Set according to the prescription | Range and settings are prescribed or otherwise clinically directed |
| User adjustment | Do not change pressure without clinical direction | Do not change the range or other settings without clinical direction |
| Equipment needs | Compatible machine, mask, tubing, and any prescribed accessories | Compatible machine, mask, tubing, and any prescribed accessories |
| Suitability | Determined by the prescribing healthcare professional | Determined by the prescribing healthcare professional |
Ultimately, the central difference is how each machine delivers pressure—not whether a person needs professional guidance. In both cases, appropriate equipment setup and a prescription are necessary.
Does an APAP machine replace CPAP?
APAP is a type of positive airway pressure device, but it does not automatically serve as an appropriate substitute for a prescribed CPAP machine. Because the devices use different pressure-delivery approaches, the prescribed equipment should match the treatment plan.
For that reason, do not switch machines, change settings, or use another person’s equipment without guidance from the prescribing healthcare professional. Instead, contact the clinician or equipment supplier if a device feels uncomfortable or seems difficult to use.
What to consider when comparing APAP and CPAP equipment
The device type is only one part of the equipment setup. In addition, these practical details may matter:
Prescription and documentation
First, confirm which device the prescription specifies and what documentation the supplier needs. Insurance coverage, authorization, and out-of-pocket costs vary by plan and individual circumstances. A supplier can explain the equipment process and check available coverage information; however, the supplier cannot guarantee approval or cost.
Mask fit and compatibility
A mask must be compatible with the equipment and suitable for the prescribed setup. For example, mask styles differ in how they fit and direct airflow. Therefore, if the mask leaks, feels uncomfortable, or is difficult to put on, ask the equipment supplier about fit and compatible options rather than changing device settings on your own.
Features and accessories
Depending on the model and prescribed setup, equipment may include features such as humidification or data displays. However, available features differ by device. Before choosing an accessory, review the manufacturer’s instructions and ask whether it works with the machine.
Setup and ongoing supplies
Also ask what to expect during equipment setup, how to operate the machine, and which replacement supplies are compatible. Follow the manufacturer’s instructions for cleaning and maintenance because recommendations can vary by product and component.
Questions to ask your healthcare professional or equipment supplier
To make the discussion more useful, consider asking:
- Which device type does my prescription specify?
- What should I do if the equipment feels uncomfortable?
- Which mask styles are compatible with this machine?
- What supplies and accessories do I need?
- How should I clean and maintain this specific model?
- What insurance documentation or other steps may be required?
- Who should I contact with equipment questions?
Frequently asked questions
Is APAP the same as auto-adjusting CPAP?
Yes. People commonly describe APAP as auto-adjusting CPAP because the machine can adjust pressure within a prescribed range. However, a healthcare professional should direct the range and use of the device.
Can I change the pressure on my APAP machine?
No—not unless your healthcare professional instructs you to change the prescribed pressure range or other therapy settings. If you have questions about your settings or therapy, contact the prescribing professional.
Can I use a CPAP mask with an APAP machine?
Compatibility depends on the machine, mask, and prescribed setup. To confirm the components work together, check the equipment manufacturer’s instructions or ask the supplier.
Will APAP feel more comfortable than CPAP?
Comfort varies by person and equipment setup. In fact, pressure-delivery approach alone does not determine whether a machine will feel comfortable. If you have concerns, discuss them with your healthcare professional or equipment supplier.
Getting help with prescribed APAP or CPAP equipment
In summary, APAP vs CPAP comes down to pressure delivery: CPAP uses one prescribed pressure, while APAP adjusts pressure within a prescribed range. Your healthcare professional determines which device is appropriate and how to configure it.
Pro-Air Medical Supply & Equipment provides respiratory equipment information and support in Saginaw, Michigan. For questions about CPAP or APAP equipment, compatible supplies, or the equipment process, contact the team at 989-355-1601 or 844-445-1122. You can also visit Pro-Air Medical Supply & Equipment for details about available services. For additional background, see the National Heart, Lung, and Blood Institute’s overview of sleep apnea treatment.