CPAP provides a fixed prescribed treatment pressure. APAP automatically adjusts pressure within the minimum and maximum prescribed for the user. Neither mode has one correct pressure for everyone, and changing mode should involve the treating clinician.
How fixed CPAP works
A CPAP machine supplies pressurized air through a mask to help keep the upper airway open during sleep. The treatment pressure follows the prescription. Ramp or pressure-relief comfort features do not mean you should choose a new clinical pressure yourself.
How APAP works
APAP responds to breathing patterns and adjusts within a prescribed range. The device does not decide whether APAP is medically appropriate for every person or replace follow-up care.
Choose according to your treatment plan
Ask about the required mode, comfort needs, humidification and review of therapy data. If symptoms or discomfort continue, check the equipment as instructed and contact your provider.
Compare compatible equipment
Use our CPAP purchase guide and mask and supply collection. Bring the prescription when comparing home and travel machines with MedEquip Shop.
Frequently asked questions
Is APAP the same as fixed CPAP?
Both deliver PAP therapy, but CPAP uses a fixed prescribed pressure and APAP adjusts within prescribed limits.
Is 10 cmH₂O the pressure everyone needs?
No. The correct settings are individualized by the clinician.
Is APAP always better?
No. Suitability depends on the diagnosis and treatment plan.
Can I switch modes myself?
Discuss a change with your treating clinician and equipment provider.
Can masks be used with either mode?
Confirm the mask’s compatibility with the particular device and prescribed setup.
