Understanding Your CPAP Data
Learn to read your CPAP numbers, interpret pressure graphs, and understand what your SD card data means for your therapy.
Your CPAP machine records detailed therapy data every night, including AHI events, leak rates, pressure curves, and breathing-pattern signals. Almost none of that data shows up in the consumer apps that ship with the machine. Articles in this category teach you what each metric means, where the data lives, and how to read it well enough to have a useful conversation with your sleep clinic.
Start with what AHI actually measures if you are new to CPAP data, or with the SD card import walkthrough if you have your card in hand and want to see your numbers tonight. Users who have already imported and want to understand what they are looking at usually jump straight to how to read your CPAP data.
Most of these guides reference your own data. CPAP Clarity reads your SD card client-side (your therapy data never leaves your browser), so you can follow along with the article on one tab and your dashboard on another.
Showing 40 of 40 articles
Understanding Your CPAP Data
40 articlesHow to Read Your CPAP Flow Rate Graph
What the breath-by-breath flow waveform shows, how to spot flattened or paused breaths, and what to bring to your sleep doctor.
CPAP Data Statistics: What Users Import
Original statistics from 4,400+ CPAP imports and 395,000 wearable nights: which machines people actually use, and what joined nights reveal.
Read DreamStation Data Without DreamMapper
DreamMapper still works, but you do not need it. Read your DreamStation data free in your browser, straight from the SD card, no account.
Paste CPAP Data Into ChatGPT or Claude
CPAP Clarity's Copy for AI button turns your nights into text you can paste into ChatGPT or Claude to ask questions. Your data never touches our servers.
Export Fitbit Data with the Google Health CLI
Pull your Fitbit sleep, heart rate, HRV, and SpO2 with Google's free command-line tool and import them into CPAP Clarity, no Takeout wait.
Read Your Whole Sleep Night on One Timeline
See every signal from one night lined up on a single timeline, so you can spot what happened together: an apnea, a leak, an oxygen dip, a shift in sleep stage.
What Is cmH2O on a CPAP?
What cmH2O means on a CPAP: the centimeters-of-water pressure unit, why CPAP machines use it, typical pressure ranges, and how it compares to hPa and mmHg.
What Is P95 on Your CPAP Report?
What P95 means on your CPAP report: the 95th percentile pressure your machine stayed at or below for 95% of the night, and when a high P95 is worth raising.
What Is Tidal Volume on a CPAP Report?
What tidal volume means on your CPAP report: the air moved in one breath, how it relates to minute ventilation, and why not every machine shows it.
ResMed AirStart 10 Data: AHI & Pressure
The ResMed AirStart 10 saves a daily summary, not waveforms. See exactly what it records, what CPAP Clarity can show you, and how to read your nightly numbers.
ResMed AirMini Data: AHI & Usage
The ResMed AirMini has no SD card, but its app exports a usage file CPAP Clarity can now import. See what data it captures, what exports, and how to get more.
ResMed AirSense 10: Get More from Your Data
Everything your AirSense 10 records on its SD card, and how to read the detailed therapy data that myAir does not show you.
Philips DreamStation Data Guide
Read your Philips DreamStation or DreamStation 2 SD card in your browser: usage, AHI, pressure, and leak. Free, private, no account, no upload.
Automate CPAP Imports With an EZShare Card
Stop pulling your CPAP SD card every morning. The homelab pattern that syncs your data automatically over WiFi, with every byte kept on your machines.
AHI vs ODI: Why CPAP and Oximeter Disagree
Your CPAP says AHI 2 but your pulse oximeter shows ODI 8. Three reasons the two numbers diverge and what to bring to your sleep physician.
Good AHI But Still Tired? Beyond CPAP Data
Your AHI is under 5 and your CPAP says everything is fine, but you wake up exhausted. Here are the signals your CPAP cannot see and how to find them.
Track CPAP Compliance From Your Imported Data
Use the CPAP Clarity compliance tracker to monitor the Medicare 70%/4-hour rule, find your best 30-day window, and project your pass date.
Still Tired on CPAP? Stepwise Guide to Why
Compliant on CPAP but still exhausted? Work through the diagnostic ladder: usage, residual AHI, RERAs, leak, sleep hygiene, and conditions beyond OSA.
Pulse Oximeters for CPAP: Why Track SpO2
An overnight pulse oximeter shows whether your CPAP is reaching your oxygen. How to read SpO2, ODI, and time below 88% on top of your AHI.
Best Free CPAP Data Tools Compared (2026)
Honest 2026 comparison of CPAP data tools: CPAP Clarity, OSCAR, myAir, SleepHQ, and SomniCharts. Privacy, price, supported devices, and which one fits you.
Why Your AHI Went Up: What to Check First
Practical triage for a sudden AHI rise. Check leak, pressure, mask age, event type, and lifestyle. When to escalate to your sleep doctor.
How to Back Up and Restore Your CPAP History
Download a zip of your CPAP Clarity history, save it locally, and restore it on any browser or computer. No cloud, no account.
Import CPAP Data from Drive, iCloud, OneDrive
Cloud-synced folders can't always be imported directly. Fix Google Drive, iCloud, OneDrive, and Dropbox placeholder errors in 60 seconds.
CPAP Therapy Cost: 5-Year Guide (2026)
What CPAP therapy actually costs over 5 years: machine, masks, filters, supplies, power. Medicare vs cash, plus a free calculator to estimate yours.
CPAP SD Card Not Working? Common Fixes
Fix SD card errors on your ResMed AirSense 10, AirSense 11, or AirCurve 10. Card not recognized, corrupt data, formatting issues, and more.
Medicare CPAP Compliance: The 4-Hour Rule
Understand the Medicare CPAP compliance rule: 4+ hours on 70% of nights in a 30-day window. Learn how to track progress and what happens if you miss.
Treatment-Emergent Central Apnea Guide
CPAP can trigger central apneas in 5-15% of users. Learn what TECSA is, how to spot it in your data, and when to talk to your doctor.
Beyond myAir: What Your ResMed Really Records
myAir shows about 5% of your CPAP data. Your SD card has detailed charts, event breakdowns, and pressure trends myAir hides. Here's how to see them.
CPAP Data Privacy: How We Protect Your Data
Your CPAP records sensitive health data nightly. Learn how different tools handle that data, and why CPAP Clarity's browser-only approach keeps you in control.
Import CPAP Data on iPhone, iPad, or Android
Read your ResMed SD card on iPhone, iPad, or Android with a USB-C card reader. Step-by-step guide with product picks and troubleshooting.
What to Bring to Your Sleep Doctor Visit
Make the most of your sleep doctor visit. Learn which CPAP metrics to share, how to get your data, and what questions to ask.
ResMed AirSense 11: Get More from Your Data
Everything your AirSense 11 records on its SD card and how to access the detailed therapy data that myAir doesn't show you.
Central vs Obstructive Sleep Apnea Explained
Your CPAP data shows different event types. Learn the difference between central and obstructive apneas and how it affects your treatment.
CPAP Pressure Settings: Average, P95, Max
What your CPAP pressure numbers mean: normal settings, typical pressure ranges by severity, fixed vs auto (APAP), what P95 is, and how to read your data.
EPR on CPAP: Expiratory Pressure Relief
What EPR means on your CPAP: how Expiratory Pressure Relief levels 1, 2, and 3 work, Ramp Only vs Full Time, and when to talk to your provider about it.
How to Use CPAP Clarity: A Complete Guide
Import your CPAP SD card in 60 seconds. See your AHI trend, leak data, and a doctor-ready PDF. Free, no account, no upload. Your data stays on your device.
Understanding Flow Limitation on Your CPAP
What flow limitation means on your CPAP data, how to read the chart, and why it matters even when your AHI looks normal.
CPAP SD Card: Stored Data and How to Read It
Your CPAP SD card holds detailed sleep data that myAir never shows you. Learn what is on the card, how to access it, and what tools can read it.
How to Read CPAP Data (AHI, Leak, Pressure)
How to read your CPAP data step by step. What AHI, leak rate, pressure, and event counts mean, with example values and good vs bad night patterns.
What Is AHI? Apnea-Hypopnea Index Explained
AHI (Apnea-Hypopnea Index) measures breathing disruptions per hour of sleep. Learn what counts as a normal AHI, the AHI severity chart, and how to read it.