The FDA released a safety communication to the public that advises consumers not to use smartwatches or smart rings that claim to measure blood glucose levels without piercing the skin. That said, there are indeed FDA-authorized blood glucose level devices that attach to your body and then send that data to smartwatch applications so that you can use your smartwatch to view the readings from an approved device.Devices, like those from Dexcom, send real-time glucose data directly to a compatible watch. For Dexcom monitors, this includes most versions of the Apple Watch. Make sure to check both your glucose monitor and your smartwatch compatibility before deciding whether or not to use your smartwatch to connect to your monitor and smartphone.