The science · Blood oxygen

Understand your blood oxygen levels

Your blood carries oxygen throughout your body. Bionny estimates your oxygen saturation (SpO₂), mainly at rest and during sleep, so you can learn your usual range.

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Runner on a lakeside road next to the Bionny blood oxygen screen

What the band tracks

How the band measures blood oxygen in three steps

Bionny band with a daily blood oxygen summary

Man looking at his Bionny band with his blood oxygen value

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Why blood oxygen is worth tracking

SpO₂ is the percentage of oxygen carried by your blood. In most healthy people it stays between 95% and 100%, and it can be naturally lower at high altitude, where the air holds less oxygen ¹.

Light-based sensors are sensitive to how you wear them: a loose band, movement, cold hands or skin factors can affect a reading ². That’s why the trend over days tells you more than a single number.

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Smiling man in the mountains wearing a Bionny band

Blood oxygen questions

Is Bionny a medical pulse oximeter?

No. It shows wellness trends. It isn’t designed to measure oxygen levels for medical purposes.

My number looks low. What should I do?

A single reading isn’t a diagnosis: check that the band is snug and look at your trend. If you feel unwell or are worried, speak to a healthcare professional.

When is it measured?

About once an hour, mostly at rest and during sleep.

Why might my first readings be less accurate?

Remove the thin protective film from the sensor and wear the band snugly. The band also needs a few days to calibrate.

Sources

MedlinePlus, US National Library of Medicine. Pulse Oximetry. medlineplus.gov
Sjoding MW et al. (2020). Racial bias in pulse oximetry measurement. New England Journal of Medicine.

Bionny is a wellness device. It is not a medical device and is not intended to diagnose, treat, cure or prevent any disease.