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Oura SpO₂ (blood oxygen), read clearly

Your Oura Ring estimates overnight blood-oxygen saturation (SpO₂). The raw percentage rarely tells you much on its own — Vitra Health reads it against your personal baseline and explains, in plain English, when a dip is worth noticing. Computed locally.

SpO₂ is easy to misread: people see a number in the 90s and panic, or ignore it entirely. The signal that matters is your own stability — whether tonight tracks your normal or drops below it.

What Vitra shows

Metric
Overnight average blood-oxygen saturation (SpO₂ %), as recorded by your Oura Ring.
Baseline
Tonight plotted against your personal rolling baseline — your normal, not a population figure.
Plain read
A one-sentence interpretation: in line with your usual, or notably lower.
Trend
A view across nights so a one-off dip isn't mistaken for a pattern.
Local
Computed on your machine. No cloud, no Vitra account.

Calm by design

Vitra treats SpO₂ like every other signal: context first, no alarm. A single low night is usually noise; a sustained drop below your baseline is the thing to notice — and a reason to mention it to a clinician. Vitra is not a medical device and does not diagnose.

Frequently asked

What is Oura SpO₂?
SpO₂ is your blood-oxygen saturation — the percentage of oxygen your blood is carrying — measured by your Oura Ring overnight. Healthy values typically sit in the high 90s; the useful signal is your own stability night to night.
What does a low or variable SpO₂ mean?
Occasional dips are normal. Consistently lower or more variable overnight SpO₂ can reflect breathing disruption during sleep. Vitra shows your trend against your baseline so you can spot a real change — it is not a medical device or a diagnosis.
How does Vitra present SpO₂?
As your overnight average plotted against your personal baseline, with a plain-English read of whether tonight was in line or notably lower for you.
Does reading SpO₂ need an Oura subscription?
Vitra itself is a one-time purchase with no subscription of its own. It reads SpO₂ through Oura's API, though — and since late 2025 Oura requires an active Oura Membership for API access on Gen 3, Ring 4 and Ring 5 (Gen 2 is exempt). So on those rings you need an active Membership for Vitra to sync. Anything already imported stays on your machine regardless.
Try Vitra with your Oura Ring

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See also
Which wearables read SpO2 overnightOura sleep stagesOura resting heart rateHow Vitra computes everything