Tracking Your Oxygen Alongside CPAP
What an overnight pulse oximeter adds to your CPAP machine's own data, what it can't tell you, and how to log it for your clinic.
Your CPAP machine records a lot. Most home machines don't record your blood oxygen, though. That's the gap a ring oximeter fills.
What does each one record?
- Your machine. Hours of use, mask leak, pressure, and the breathing events it counted.
- Your ring. SpO2 and pulse, every few seconds, all night.
They're two different measurements. The machine's event count comes from airflow. Your ODI comes from oxygen. The two numbers won't match, and they aren't meant to.
What can you see with both?
- Your oxygen numbers on the nights you used the machine all night.
- Your oxygen numbers on nights you took the mask off early.
- Whether a night with a lot of mask leak looks any different on the oxygen chart.
- How your numbers this month compare with last month.
That's viewing and logging. It tells you what happened, not why.
What can't it tell you?
It can't tell you whether your therapy is working, or whether your settings are right. A home oximeter isn't a sleep study, and a ring can read low because of a cold hand or a loose fit.
So don't change your pressure, your mask or how many hours you use the machine because of a ring. If you see something you don't like, take the recordings to your sleep clinic and ask. Any question about settings is theirs to answer.
How do you keep the two in step?
- Wear the ring every night for at least a week, so one odd night doesn't stand out.
- Check the clocks. If the ring and the machine disagree on the time, the charts won't line up.
- Write down anything unusual: a cold, a late drink, a new mask your clinic gave you.
- Keep the ring's CSV exports. Your clinic may want the raw files.
Which software should you use?
If you want the oxygen trace laid over your machine's data, use OSCAR or SleepHQ. Both import CPAP data and oximetry. We compared them in ViHealth alternatives.
PulseOxTracker doesn't read CPAP data. It covers the oximeter side: weeks of nights on one page, with tags for things like "mask off early" or "new mask". Then you can compare nights with and without a tag.
What should you bring to your clinic?
- Two or three weeks of nights, not one bad one.
- Your notes on what was different each night.
- Your question, written down.
There's more in sharing oximeter data with your doctor.
Not a medical device. Does not diagnose, treat or prevent any condition. Discuss results and changes with a clinician.