Oxygen saturation, often shortened to SpO2, is a measure of the concentration of oxygen in your blood. On numerous Samsung phones, SpO2 can be measured using a series of sensors on the back of the phone in a method called pulse oximetry, which emits and absorbs a light wave through the blood vessels in your fingertip.

Samsung has moved this feature around quite a bit and even removed it entirely on many of its newer phones, but if your device still has the capability to read SpO2, it can be a useful health measurement.

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How to measure oxygen saturation

As mentioned above, Samsung has phased out many of its once-commonplace sensors on newer phones like the Galaxy S20, but older devices like the S10 are still capable of measuring oxygen saturation using the Samsung Health app. It’s a fairly simple process so long as your phone supports it — here are the…

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