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KNOWLEDGE HUB
Learn: your CPAP data, explained in plain English
Your machine records a lot every night. This is where we explain what each number means, where it comes from, and what is worth raising with your clinician. Evergreen, no jargon, no sales pitch.
How to use this hub
Every guide here follows the same shape. It tells you what the metric is, how your ResMed machine measures it, what the widely accepted definitions say, and how it looks inside Apnealytics. Each one ends with a short FAQ and links to the product features and machine pages that touch the same number.
Start with the basics if you are new to therapy. If you have been reading your data for a while, jump to the advanced pages on flow limitation, central events and waveforms. Nothing here is medical advice; the goal is to make your conversation with your clinician sharper, not to replace it.
Six categories. Start with the basics, or jump ahead.
BasicsThe vocabulary of therapy. What AHI is, what a good AHI on CPAP looks like, what a hypopnea is and how usage hours turn into the 4-hour/70% compliance rule your insurer may care about.What is AHI?What is a good AHI on CPAP?Hypopnea explainedCPAP usage hours and adherence
Leak and mask fitLeak is the number most likely to quietly undermine a night. Why the 95th percentile matters more than the average, and how to tell a mask problem from a mouth problem.CPAP leak rate explainedMask fit and leak analyticsMasks that work with Apnealytics
Pressure and comfortPressure is a range, not a number. What P95 pressure tells you, how auto machines decide where to sit, and what EPR and Flex do on exhale.CPAP pressure settings explainedWhat is P95 pressure?EPR and Flex explainedFlow limitation explained
EventsNot every event is the same. How a machine tells an obstructive apnea from a central one, and why "unclassified" shows up when leak is high.Central vs obstructive apnea on CPAPHypopnea explainedReading CPAP waveforms
OxygenYour machine cannot see your blood oxygen. An oximeter can. What SpO₂, ODI and T90 mean beside your therapy data.SpO₂, desaturation, ODI and T90Oxygen overlay in ApnealyticsOximeters that work
ScoresSingle-number scores are convenient and easy to over-read. What goes into our Sleep Score and ResMed's myAir score, and what neither can show.Sleep Score explainedmyAir score explained
The four most people read first.
What is AHI?The one number everyone looks at first. What it counts, why your machine's AHI differs from a sleep lab's, and the severity bands clinicians use.Read →
CPAP leak rate explainedWhy ResMed reports unintentional leak, what the large-leak threshold is, and how to read leak P95 on your dashboard.Read →
Reading CPAP waveformsA visual tour of airflow, pressure and leak traces, with the shapes to look for and the ones that are usually noise.Read →
Central vs obstructive apnea on CPAPHow a machine decides your airway was open or closed during an apnea, and why that distinction matters.Read →
Every metric here maps to a place on your dashboard.
Every metric in these guides maps to somewhere on your dashboard: last-night AHI with its band, usage hours, leak P95, pressure P95 against your set range, EPR, respiratory rate and event composition. Trends shows them over 30 nights, 90 nights, a year or all time. Pro adds the breath-by-breath viewer for the raw traces and the oxygen overlay for oximeter data. All of it starts with your SD card.
A note on sources: severity bands and the hypopnea scoring rule come from the American Academy of Sleep Medicine. The 4-hour/70% adherence rule comes from US Medicare coverage policy, which most private insurers mirror. Device-specific thresholds come from the manufacturer's own documentation. If you spot an error, tell us at info@apnealytics.com.
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