A new validation study published this month puts the blood oxygen feature of the Apple Watch to the test.According to the results of the study, the Apple Watch Series 6 is able to “reliably detect states of reduced blood oxygen saturation” in comparison to medical-grade pulse oximeters.The objective of the study was to investigate “how a commercially available smartwatch that measures peripheral blood oxygen saturation (SpO2) can detect hypoxemia compared to a medical-grade pulse oximeter.”For the study, researchers recruited 24 healthy participants.The study resulted in 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 90%-100% and up to 8% for SpO2 readings less than 90%.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%."