I just upgraded from a Note 8 to a Note 10+, so I finally got to try out the blood pressure function on my Galaxy Watch Active. I have it working, and have tested it with a OMRON blood pressure cuff, and also double checked with manual measurements with a sphygmomanometer/stethoscope. Both the automatic cuff and manual measurements agree with each other pretty much dead on. I can calibrate the watch and it might be within +-5 for readings directly after calibration, but if you try it later on the day or days later, it can have wild swings that are more than +-15 when once again comparing to the automatic or manual cuff readings. That makes it pretty worthless, and that's probably why this feature has flopped for Samsung. Either it's technically not possible to get accuracy on a wrist that uses LEDs to try to calculate the blood pressure, or the technology isn't ready for prime time. If you Google around about it, most medical references seem to agree that you just aren't going to have a reliable and accurate reading without having an inflatable cuff that's actually going to occlude the artery to measure the traditional way. I understand everyone's anxiousness to have the feature working on their watch, and the frustation in the initial advertising that seemed to imply this was a feature ready for prime time. I was one of those people on both counts, but after actually using it for several days, it's pretty obvious that the feature is worthless in its current implementation.
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