If you're on bilevel (BiPAP) therapy with a ResMed AirCurve, your machine records the same detailed session data as the AirSense CPAP models -- plus additional pressure data specific to bilevel therapy.
The AirCurve records both your IPAP (inspiratory pressure) and EPAP (expiratory pressure), pressure support levels, and the same breath-by-breath flow waveforms. All of this lives on the SD card.
This guide covers both the AirCurve 10 and AirCurve 11 series (VAuto, ST, ASV, and CS models).
What You'll Need
Your ResMed AirCurve 10 or AirCurve 11
A computer (Mac, Windows, or Linux)
An SD card reader (if your computer doesn't have a built-in slot)
Step 1: Find the SD Card Slot
AirCurve 10
Rear view of AirCurve 10 showing the SD card slot on the back panel, near the base
The AirCurve 10's SD card slot is on the back of the machine, near the bottom. It's a bit harder to spot than on the AirSense 10 (which has it on the side). Look for a small cover or rubber flap near the power connection. It uses a standard full-size SD card.
AirCurve 11
Side view of AirCurve 11 showing the SD card slot location
The AirCurve 11 follows a similar layout to the AirSense 11 -- the SD card slot is on the side of the device behind a small panel. It may contain a micro SD card in a full-size adapter.
Step 2: Remove the SD Card Safely
Power off your AirCurve. Unplug it from power.
Locate and open the SD card cover.
Push the card inward gently to release it.
Pull the card out.
Important for BiPAP users
Your bilevel settings (IPAP, EPAP, backup rate for ST/ASV modes) are stored in the machine's internal memory, not on the SD card. Removing the card does not change your therapy settings.
Step 3: Connect to Your Computer
Insert the SD card into your computer's card reader. The card appears as a removable drive.
Step 4: What's on the Card
The AirCurve folder structure mirrors the AirSense series:
SD Card/ ├── DATALOG/ │ ├── 20260101/ │ ├── 20260102/ │ └── ... ├── SETTINGS/ ├── Identification.tgt └── STR.edf
The DATALOG folder contains your nightly EDF files. For bilevel machines, these files include:
Flow waveform data (same as CPAP models)
IPAP and EPAP pressure channels (instead of a single pressure channel)
Pressure support data
Respiratory events (apneas, hypopneas, central events)
For ASV/CS models: target ventilation and minute ventilation data
Step 5: Upload to AirwayLab
Go to airwaylab.app/analyze.
Click “Upload SD Card.”
Select the SD card or DATALOG folder.
AirwayLab auto-detects your AirCurve model and runs the analysis.
Privacy
All processing happens in your browser. Your data stays on your device.
Step 6: What You'll See
AirwayLab's dashboard for bilevel data shows:
AHI and event breakdown
Including central events (relevant for ASV users).
Flow limitation scoring
Partial airway narrowing detection across all breath shapes.
Pressure support analysis
IPAP/EPAP levels through the night.
Breathing pattern metrics
Regularity and stability of your breathing.
Leak trends
Mask seal performance over time.
Bilevel users often have more complex therapy needs. The detailed breathing data from your SD card gives you and your clinician more information to work with than AHI alone.
BiPAP-Specific Notes
VAuto users
Your machine adjusts EPAP automatically and varies pressure support. The SD card captures these adjustments breath by breath, so you can see exactly how the machine responded through the night.
ST (Spontaneous-Timed) users
The data includes backup breath triggers. You can see when the machine initiated a breath versus when you did.
ASV (Adaptive Servo-Ventilation) users
ASV data includes target ventilation and the machine's servo response. This is particularly useful data to share with your sleep specialist.
Frequently Asked Questions
I'm on BiPAP. Is AirwayLab still useful for me?
Yes. AirwayLab's flow limitation and breathing pattern analysis works with bilevel data. The core analysis -- detecting partial airway narrowing and breathing instability -- applies regardless of whether you're on CPAP or BiPAP.
Does AirwayLab show IPAP/EPAP separately?
Yes. Bilevel sessions display both pressure channels so you can see how your machine adjusted throughout the night.
My AirCurve has an older firmware. Will my data work?
AirwayLab supports EDF files from all AirCurve 10 and AirCurve 11 firmware versions. If you run into an issue with a specific firmware version, let us know on the community page.
Medical disclaimer
AirwayLab is not a medical device. The analysis provided is informational and educational. Always discuss your results with your sleep physician or clinician. AirwayLab does not diagnose, treat, or provide clinical recommendations.
Related reading
Getting Started Guide -- new to AirwayLab? Start here.
Analyze Your Data -- ready to upload your SD card?
Understanding Flow Limitation -- what flow limitation is and why it matters for bilevel users.
Analyse Your BiPAP Data
Upload your AirCurve SD card to AirwayLab and see your bilevel therapy data analysed in detail. Free, open source, and your data never leaves your browser.