Wearables Claiming to Measure Blood Sugar Levels May Be Inaccurate, Warns US Agency. The Food and Drug Administration (FDA) has issued a safety communication warning against using smartwatches and smart rings that claim to measure blood sugar levels without pricking the skin. These devices have not been authorized, cleared, or approved by the FDA for … Continue reading US FDA Warns Against Using Non-Invasive Blood Sugar Monitoring Devices Due to Lack of Accuracy