CPAP, APAP and bilevel PAP deliver pressurized air through a mask, but they manage pressure differently. Your diagnosis and prescription determine the appropriate therapy; they are not interchangeable simply because one device sounds more comfortable.
CPAP: one prescribed treatment pressure
Continuous positive airway pressure delivers a fixed prescribed pressure to help keep the upper airway open during sleep. Comfort features such as ramp and expiratory pressure relief do not turn it into a different prescribed therapy.
APAP: adjustment within prescribed limits
Auto-adjusting PAP changes pressure in response to breathing patterns within the range set by the treating clinician. Whether it suits you depends on your diagnosis, treatment response and the capabilities of the specific machine.
Bilevel PAP: separate inhalation and exhalation pressures
Bilevel equipment uses a higher inspiratory pressure and a lower expiratory pressure. Some models offer additional modes or a backup rate. Those features serve particular clinical needs and must match the prescription. BiPAP is a commonly used brand term for bilevel therapy.
Choose with your clinician, then compare equipment
Ask which mode and pressure settings you need, whether humidification is recommended and how your progress will be reviewed. Persistent discomfort or symptoms call for a clinical review rather than self-selecting a new pressure mode.
Compare prescribed equipment at MedEquip Shop
Browse our CPAP purchase guide, compatible masks and supplies or CPAP and BiPAP rental information. A valid prescription is required for machine purchases and rentals. Call 713-669-0518 to confirm current options.
Frequently asked questions
What is the main difference between CPAP and APAP?
CPAP uses a fixed prescribed pressure; APAP adjusts within a prescribed pressure range.
How is bilevel PAP different?
It provides separate inspiratory and expiratory pressures. Specific models and modes meet different prescribed needs.
Is bilevel PAP always better than CPAP?
No. The appropriate therapy depends on your diagnosis and clinical needs.
Can I change from CPAP to APAP myself?
Discuss a change with your treating clinician. A different mode or device may require an updated prescription and setup.
Can I compare machines before purchasing?
Yes. Bring your prescription to MedEquip Shop so we can discuss machines that support the required therapy.
