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→Leak Rate
===Flow Limitation===
===Leak Rate===
The leak rate graph indicates whether excessive mask leaking occurred, and to what extent. All CPAP masks are designed to leak or vent surplus air away from the user's nose or mouth. This flushes away the exhaled breath and prevents the user re-breathing his expelled CO2. The actual amount of this designed leak will vary according to the mask. Anything in excess of that amount is "additional leak".
Resmed machines show a single trace indicating the additional leak. By default (in accordance with Resmed guidelines), Oscar flags any additional leak over 24 L/min as an excessive or "large leak". You can adjust the red line between acceptable and unacceptable leaks by using '''File | Preferences | CPAP | Flag leaks over threshold'''.
Philips machines show two traces - total leak and additional leak. It is the lower additional leak line which indicates whether the leak is excessive or not.
[[File:OSCAR Leak graph Resmed.png | 1000 px | Leak graph from Resmed machine showing excessive leakage]]
<br>Leak graph from Resmed machine showing excessive leakage
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[[File:OSCAR Leak graph Philips.png | 1000 px | Leak graph from Philips machine showing upper and lower traces]]
<br>Leak graph from Philips machine showing upper and lower traces
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===Snore===
<!-- The material below this line is from RobySue's guide to SleepyHead. Most of it duplicates the newer material above and has been deleted -->
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