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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 30 of 30 articles

Understanding Your CPAP Data

30 articles
·9 min read

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.

·13 min read

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.

·12 min read

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.

·10 min read

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.

·10 min read

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.

·13 min read

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.

·8 min read

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.

·12 min read

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.

·10 min read

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.

·10 min read

Best Free CPAP Data Tools Compared (2026)

Honest 2026 comparison of CPAP Clarity, OSCAR, myAir, and SleepHQ. Strengths, weaknesses, supported devices, and which free CPAP data tool fits your needs.

·11 min read

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.

·10 min read

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.

·12 min read

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.

·8 min read

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.

·7 min read

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.

·10 min read

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.

·15 min read

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.

·11 min read

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.

·11 min read

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.

·7 min read

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.

·13 min read

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.

·11 min read

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.

·10 min read

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.

·16 min read

CPAP Pressure Settings: Average, P95, Max

What your CPAP pressure numbers mean: fixed vs auto pressure, what P95 (95th percentile) pressure is, and how to read your pressure data.

·13 min read

Understanding EPR: Expiratory Pressure Relief

EPR makes breathing out easier on your CPAP. Learn what the EPR settings mean, how they affect your therapy, and whether you should change yours.

·13 min read

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.

·11 min read

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.

·13 min read

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.

·15 min read

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.

·14 min read

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.