Overall I'm very skeptical about the blood oxygen accuracy, and Apple itself says "measurements taken with the Blood Oxygen app are not intended for medical use and are only designed for general fitness and wellness purposes." Unlike the ECG, the Blood oxygen levels have no "clearance" with FDA.

The new Cardio Fitness Levels feature comes with the release of iOS 14.3 and watchOS 7.2, and expands on the Apple Watch’s existing VO2 max feature.. VO2 max is the maximum amount of oxygen your

Currently, it is not possible to change the frequency. It is an automatic process that happens if you have background measurements enabled and when you are not moving. You can submit feedback regarding this here: Product Feedback. Have a good one! ( 0) of 1.
If you can't follow the steps above, you can try the older method of reading your SpO2 levels within Samsung Health. Follow these steps: Step 1: Launch Samsung Health on your Galaxy device. Step 2: Scroll to the bottom, tap on Manage items and enable Oxygen saturation if necessary. Step 3: Tap Measure next to Oxygen saturation from the app's
lobsterghost1. I don't believe either option you've aske about is a feature of Apple Watch. Have you read this link about Blood Oxygen --> How to use the Blood Oxygen app on Apple Watch - Apple Support. I would strongly disagree Apple Watch is useless. It is not a medical device, but it does sample Oxygen levels and you can check the readings
Screenshot by CNET. Apple's new Apple Watch Series 6 goes all-in on health care, including a new feature to measure blood oxygen level -- a vital sign that's been helpful monitoring COVID-19
XQk5.
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    • check oxygen level on apple watch