If all is well, tap Done. If not, you can add any symptoms you’re experiencing,
and again, contact your doctor or emergency services if you suspect something
serious is going on.
MEASURE YOUR BLOOD OXYGEN LEVEL
With an Apple Watch Series 6 and watchOS 7 or later, you can use a built-in app
and oximeter to measure your blood oxygen level. This reading can tell you
whether you’re getting enough oxygen to your brain and other vital organs. A
typical reading should be somewhere between 95% and 100%. A low percentage
of oxygen in the blood can be a sign of a pulmonary or cardiac issue or another
related problem.
Though you shouldn’t rely on this sensor as your sole source of information on
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you to alert your doctor.
To set up the Blood Oxygen sensor, open the Watch app on your iPhone and tap
the setting for Blood Oxygen. Make sure the switch for Blood Oxygen
Measurements is turned on. Here, you can also control when the sensor
takes background readings by enabling or disabling In Sleep Mode and In
Theater Mode.
To take a reading, open the Blood Oxygen app on your watch. Make sure your
watch is not too low on your wrist and that the band is snug but comfortable.
Keep your hand and wrist as still as possible during the reading. Tap the Start
button to begin the scan. The sensor begins with a 15-second countdown. If the
measurement is successful, the screen will then indicate the percentage of your
blood oxygen level.