Does the 6 detect afib?
does the Apple Watch 6 detech afib
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Yes it does,read here;
Atrial fibrillation
An AFib result means the heart is beating in an irregular pattern. The ECG app ver. 1 can check for AFib between 50 and 120 BPM. The ECG app ver. 2 can check for AFib between 50 and 150 BPM.* AFib is the most common form of serious arrhythmia, or irregular heart rhythm. If you receive an AFib classification and you have not been diagnosed with AFib, you should talk to your doctor.
That is a quote from here;
Taking an ECG with the ECG app on Apple Watch Series 4, Series 5, or Series 6 – Apple Support