Cold weather can also impact sensor performance, so warming up your wrist before measurement can help. Troubleshooting Common Issues If the reading fails, ensure your wrist is relaxed and your arm is at heart level.
Apple Watch Oxygen Tips Best Results
Background Measurements Beyond manual checks, the watch can take readings in the background while you sleep. The back crystal of the watch houses four LEDs and four photodiodes that work together to emit light and measure reflections.
Ensure the "Measure Blood Oxygen" setting is enabled in the Watch app. Remove any debris or sweat from the back of the watch.
Apple Watch Oxygen Tips Best Results
The measurement process typically takes 15 seconds, during which you must remain still to ensure accuracy. It serves as an excellent screening tool rather than a replacement for clinical pulse oximeters.
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