CPAP and BiPAP are the most popular sleep apnea therapies that offer the potential of a rapid solution to pauses in breathing during sleep. If you have sleep apnea, it is likely that your physician has discussed one or both of these solutions. Many patients wonder if one is better than the other. Here we discuss the differences between Bipap and CPAP and when each option is used.

What is the difference between CPAP and BIPAP?

Both CPAP and BiPAP are treatments for sleep apnea that use airway pressure to treat pauses in breathing during sleep. Each technology has unique benefits that is used to treat sleep disordered breathing problems. While there are differences between the two, there are also many similarities. Read on to discover CPAP vs BIPAP information that may assist you in finding the best solution.

What is CPAP?

CPAP stands for continuous positive airway pressure. It is the most popular treatment for obstructive sleep apnea (OSA). It uses air pressure generated by a machine, delivered through a tube into a mask that fits over the nose or mouth.1

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What is BiPAP?

BiPAP refers to Bilevel or two-level positive airway pressure. Like CPAP, air is sent through a tube into a mask that fits over the nose. While CPAP generally delivers a single pressure, BiPAP delivers an inhale pressure and an exhale pressure. BiPAP is a trademark of Respironics.

Which is better, CPAP or BiPAP?

Each is used for a special purpose. Historically, BiPAP was more expensive than CPAP. BiPAP is often used when CPAP is not tolerated by the user. There are new technologies that increase comfort with CPAP.2


BiPAP is sometimes used in patients who have pulmonary (lung) issues, like COPD. The difference in pressures helps to eliminate extra CO2 carbon dioxide gas from the body. The side effects of CPAP machines are the same.

CPAP and BiPAP machines look similar. The attachments are the same. They both use the same CPAP mask and the same CPAP supplies.

There are other type of ventilatory support devices, including Adaptive Servo Ventilation (ASV).

More On BiPAP or CPAP

The CPAP machine is designed to deliver air pressure through the nostrils into the back of the throat in order to keep the airway open. The pressure is adjustable. There are several potential modifications to the way the air can be delivered in order to keep the airway open during sleep.

The BiPAP or bilevel machine is very similar to the C-PAP machine. Utilizing the identical setup as a CPAP with tubing and masks, the BiPAP uses a different pressure setting. While CPAP delivers one pressure, BiPAP delivers two pressures. These two pressures are known as inhalation positive airway pressure (IPAP) and exhalation positive airway pressure (EPAP).

cpap bipap

BiPAP is often used with individuals who need extra respiratory support. It is often prescribed for patients with congestive heart failure/coronary artery disease and pulmonary or neurologic medical disorders. Patients with neuromuscular disorders may also benefit from the pressure differential of a bilevel positive airway pressure device.

The BiPAP is usually preset with two settings. The effort when inhaling and exhaling is monitored. When the  person sleeping doesn’t breathe for a programmed period of time, the BiPAP may be set to deliver a breath. This is usually set as a minimum breath or ‘back-up rate’ that sets a minimum breaths per minute (BPM).

This setting is designed so that the patient breathes a set frequency of breaths per minute. One of the many  advantages of the BiPAP machine is that the strain is decreased during expiration. This limits the amount of energy expended during exhalation. In other words, it is easier to breathe out with BiPAP than with CPAP.

New BiPAP machines are similar in size to CPAP devices. They are about the size of a lunchbox. Many are very quiet. They’re designed to be silent so as not to interrupt the sleeper. Most BiPAP units offer a humidifier option to prevent the drying of the mucosal membranes.

CPAP, BiPAP machine

In summary, the primary difference between CPAP and BiPAP, or bilevel, machines is the pressure differential. While CPAP has one pressure. BiPAP has two pressures. The ordering sleep physician usually decides what type of breathing treatment should be used. A sleep study often aids in the decision making of this process.

BiPAP is a trademark of Respironics and is a promotional partner of ASA.

What are the similarities between CPAP vs BiPAP?

CPAP and Bilevel PAP both use air pressure for the treatment of sleep disordered breathing. Both use the exact same attachments. This includes the cpap mask, hose, filter, humidifier. Both sleep breathing machines now come in portable versions which can be transported very easily. Both can be used for treating obstructive sleep apnea.

29 thoughts on “CPAP vs BiPAP

  1. Lorie Patel Reply

    I had an in house sleep study, they said I was having quite a bit of leg movements and 45 apneic events per hour. They set my rate at 14 PEEP. They also said it was “mixed” apnea (part central and part obstructive). She said I was not getting any REM sleep. I continue to have a high AHI (12-19/hr.) and feel as though I am still not resting. I feel like I am not exhaling completely. Should I inquire with my physician about bipap? I am thinking that raising my CPAP rate will make it even more difficult to exhale?

  2. Micahel Reply

    WTF..I have been using a CPAP religiously for 9 years. of the nine i think the first year and a half i was benefiting from it. I have complained for the rest of the time trying to get a test with the BIPAP to no avail. what can i do or say to make this happen?

  3. Graham Reply

    I currently use a CPAP and suffer from extreme bloating. Even with the water tank in use I suffer with a dry mouth and occasional dizziness. My machine is “auto set” and apparently is not adjustable. Is this correct ?

    • Anonymous Reply

      I have a bipap and in the past had a cpap. They both record all your sleeping patterns and are monitored by my sleep specialist on if its working or not. I find that since changing to bipap i sleep so much better

    • Paul M Reply

      No, but the opposite is true. If maximum and minimum inhalation and exhalation pressures are set the same on a BiPAP machine you’ve effectively turned it into a more expensive CPAP machine. One thing that isn’t mentioned here is that BiPAP is also used to treat central sleep apnea. This is where the brain literally forgets to tell the body to breathe. I don’t know why using two different pressures helps with central sleep apnea, I just know that I have both central and obstructive apnea and my BiPAP machine finally lets me get restful sleep.

  4. Maung Maung Reply

    I don’t have enough sleep because of sleep apnea or anxiety and depression. How do I distinguish?. Need help. Wake up min 2 times per night.

    • Paul M Reply

      Have your doctor send you to a sleep specialist. They may prescribe a sleep study, which should be done in a hospital or sleep center rather than at home. The home tests are much more convenient but do not provide the physician with ALL the information for a proper diagnosis.

    • Anonymous Reply

      I’m having the same issue. I have had a sleep study and have been diagnosed with OSAS but I cannot acclimate myself to the CPAP due to anxiety and insomnia.

    • Patricia Taylor Reply

      Hello Anonymous my experience with not getting any results from the Cpap and having Insomnia literally took me 7 years and 5 doctor’s before I was properly diagnosed with Sleep Apnea and Narcolepsy and I was placed on a Bipap machine and along with my meds for periodicSleep Apea I have been given meds specifically for Narcolepsy. So just keep hounding your doctor for another sleep study or dont be embarrassed to get 2nd 3rd or 4th opinoon
      Good luck!!

  5. Desmond Reply

    I just got the (mask) and tried it last night. I have the mask that just covers my noise, but I could only use it for 15min. I feel like I just can’t enough air and find myself taking deep breaths and begin to panic. It’s like a suffocating feeling. Any suggestions? Thank you

    • Anonymous Reply

      U need a full face mask! My fiancé did that and he has to us a full face mask no matter what!

    • Bill Reply

      lower your ramp time to 5 min or lower. you’ll get full pressure sooner. mine was 20 minutes now I use 0

  6. Chuck McConville Reply

    I have a Bi-pap machine and sometimes I get water in my nose while sleeping . any ideas?

    • Steve Reply

      That just happened to me for the first time this week…I thought I may have the humidification up too high…has not happened since

  7. Carolyn Cornie Reply

    I also have Idiopathic Hypersomnia and have 1-2 naps daily of 1-2 hrs each. Is this time included in the statistics? If so, does which ‘day’ is it added to?

  8. Arnold Cabral Reply

    People who read this which is better Inspire device, Cpap,or Bipap ….Thanks

  9. Daniel Faust Farwell Mi. Reply

    Please keep in mind if you dont have anything but medicaid, these sleep study hospitals and clinics will say you need a c-pap just to get paid, when you truly cannot use a c-pap and need a bi-pap. at the expense of your brain and entire body including all your organs eventually shutting down completely, and sometimes even death while sleeping. I know this because after nearly 4 years of fighting to get what i need and still not having the bi- pap yet, i now have no memory left and all my entire organs and health is bad.

    • Rick Reply

      most cpap machines you can change it yourself. if you believe its that critical i would just do a utube search on the how to and get it done. push and hold which two buttons is all you need to know. hint; most only have 2 buttons.
      hope that helps

  10. sharon ouka Reply

    I’m curious why my dr. didn’t order the Bipap instead of the cpap. in reading it looks like the bipap would have been better suited for me, since i do have COPD, and had lung cancer in 2013 with the removal of lower left lobe of my lung. a bit confused

    • Anonymous Reply

      BiPap is considerably more expensive and needs more monitoring than is considered safe in a home. CPAP is generally set it and leave it.

  11. Sandra Wosk Reply

    what happens if you can’t stand stuff on your face but really need something to help you breathe? is oxygen better or cpap machine I have copd .. I wake up lots of times at nite with a mouth so dry tongue is stuck to the roof of my mouth and I can’t breathe… mouth so dry I can’t swallow either.. so what next?

    • Anonymous Reply

      My dry mouth was solved by wearing a chin strap. This keeps my mouth from opening during the night.

  12. jaredh4 Reply

    Many people used to find bipap more comfortable than cpap. That was during the olden days. Now, the new CPAP machines have settings that allow them to be more comfortable. C-flex and similar technologies have revolutionized how we make cpap more comfortable for patients.

  13. rasool Reply

    I have a question
    what is differences between s – t – st modes in bpap?

    • lori gregory Reply

      S-MODE is spontaneous mode and is the normal, default mode no changes to rate or anything.
      ST-MODE is spontaneous timed mode. this mode will kick in an extra breath if the patient’s respiratory rate falls below the set “back up rate.”
      T-MODE is timed mode. this mode is almost like a ventilator in that it automatically gives the patient the exact number of breaths that is programmed, or input.

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