Today’s contemporary CPAP devices are incredibly capable and sophisticated machines that can deliver a wide range of specific CPAP results in the form of data each morning. It is important to monitor and understand the data that your CPAP machine records every night. While devices vary by complexity, function and price, the best CPAP machines include several important statistics about your nightly sleep patterns. Let’s look at the unique metrics you should track while undergoing CPAP therapy.

guide to cpap results

Your Sleep Duration CPAP Results

The first piece of information that all CPAP devices manage is the duration of CPAP usage over the course of a night, week, month, or year. The readout verifies that you’re using the CPAP as intended. This is why it is important to keep a close eye on your CPAP readings.

AHI Severity Index

The Apnea-Hypopnea Index (AHI) demonstrates the user’s level of Obstructive Sleep Apnea (OSA) by creating a “number of OSA episodes per-hour” figure. In general, 0-5 events per hour is normal, 5-15 is mild OSA, 15-30 indicates moderate OSA, and anything above 30 equates to severe Sleep Apnea. If you see a steady rise in OSA events as indicated by the AHI figure, consult with your sleep specialist right away.

Leak Rate

CPAP devices will leak, but it is intentional. As the user breathes, they exhale carbon dioxide and must be exhausted to prevent a dangerous respiratory situation. Each CPAP therapy mask features a set of specially-designed holes that vent (leak) carbon dioxide as the user exhales. Most machines will show a “normal” leak rate if the amount registers 20-24L/minute or less. Anything above that and you’re likely dealing with a poor-fitting mask.

Pressure Statistics

Your CPAP results will show the percentage of time the Auto Adjust feature worked to bring your pressure levels up to the maximum setting. If your CPAP adjusts the positive airway up to the maximum level of pressure, more than 10% of your sleeping hours, you might want to increase the ceiling pressure of the device. You can consult with your sleep specialist to re-calibrate the CPAP, if necessary.

Other Indices

Beyond pressure statistics, average hours of use, AHI indices, your CPAP machine can also deliver information such as:

  • Number of spontaneous arousals per hour. This means any non-respiratory events detected during the night that may indicate other health issues.
  • RDI, or Respiratory Disturbance Index. The RDI includes respiratory issues like snoring, hyperventilation, desaturation, and more.
  • PLM figures, or periodic limb movements. Periodic Limb Movements are repetitive limb movements that can disrupt sleep. Your CPAP machine can analyze this movement to identify other concerns, including chronic PLM.

Your CPAP device is designed to keep watch on your sleep throughout the night. This data can help you and your doctor make informed decisions about your respiratory health and treatment regimen. For more information about CPAP devices, including those that offer the latest in diagnostic reporting capability, contact the experts at today!

Daniela has researched and published over 60 articles covering topics that aim to inform and empower people living with Sleep Apnea. As an avid reader and researcher, Daniela continues to grow her knowledge about Sleep Apnea and CPAP therapy everyday with the help of coworkers, customers, and members of other CPAP communities online.


  1. Joann Porter Reply

    I don”t understand the numbers 0.7 is how many times in a hour period and 1.0 in a 4 hour period i dont understand what that means could you please help me on the numbers to better understand been waking up with headaches ever since i started using machine
    Thank you

    • AHI is expressed in terms of numbers and decimals and is a composite score of a couple of different factors. These can include the number of times you stop breathing during the night, and the number of times blood oxygen drops to an unsafe level. It’s hard to say what your AHI score is made up of unless your machine keeps track of the individual events. Just know that a 1.0 or a 0.7 AHI is very good if that’s what you’re referring to. It means your therapy is working well.

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