The Blood Oxygen Sensor In Apple Watch Is As Reliable As ‘Medical-grade Device’

A new validation study published this month puts the Apple Watch’s blood oxygen feature to the test. In comparison to medical-grade pulse oximeters, the Apple Watch Series 6 can “reliably detect states of reduced blood oxygen saturation,” according to the study’s findings. Here’s how the study came to this conclusion…

How reliable is the blood oxygen sensor in the Apple Watch?

According to MyHealthyApple, the study was published this month in the open-access journal Digital Health. The study’s goal was to see “how a commercially available smartwatch that measures peripheral blood oxygen saturation (SpO2) compares to a medical-grade pulse oximeter in detecting hypoxemia.”

The study’s 24 healthy participants were recruited by the researchers. On their left wrist, each person wore an Apple Watch Series 6 and a pulse oximeter sensor on their left middle finger (the Masimo Radical-7).

The participants breathed via a breathing circuit with a three-way non-rebreathing valve in three phases. First, in the 2-minute initial stabilization phase, the participants inhaled the ambient air. Then in the 5-minute desaturation phase, the participants breathed the oxygen-reduced gas mixture (12% O2), which temporarily reduced their blood oxygen saturation.

In the final stabilization phase, the participants inhaled the ambient air again until SpO2 returned to normal values. Measurements of SpO2 were taken from the smartwatch and the pulse oximeter simultaneously in 30-s intervals.

The research yielded 642 individual pairs of blood oxygen measurements:

The differences in individual measurements between the smartwatch and oximeter within 6% SpO2 can be expected for SpO2 readings of 90%-100% and up to 8% for SpO2 readings less than 90%.

As a result, the researchers reach the following conclusion:

The bias in SpO2 between the smartwatch and the oximeter was 0.0% for all the data points. The bias for SpO2 less than 90% was 1.2%. The differences in individual measurements between the smartwatch and oximeter within 6% SpO2 can be expected for SpO2 readings 90%–100% and up to 8% for SpO2 readings less than 90%.

Apple first added blood oxygen measurement support to the Apple Watch Series 6. It’s also a feature on the newest Apple Watch Series 7, Apple Watch Series 8, and Apple Watch Ultra. Apple has been hesitant to promote the feature with any actual medical claims, and the company hasn’t advertised any significant improvements to the technology since it first debuted on the Series 6 in 2020.

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