(NEWSnet/AP) — The U.S. Food and Drug Administration issued a warning Wednesday over the use of smartwatches and rings that claim to measure blood sugar levels without piercing the skin.

The use of the devices can lead to inaccurate measurements of blood sugar and could lead to errors in diabetes management that can be life-threatening.

The caution applies to any watch or ring, regardless of brand, that claims to measure blood glucose levels, the agency said. The FDA said it has not authorized any such device.

Using the unapproved smartwatch and smart ring devices could result in inaccurate blood sugar measurements, with “potentially devastating” consequences, said Dr. Robert Gabbay, of the American Diabetes Association. That could cause patients to take the wrong doses of medication, leading to dangerous levels of blood sugar and possibly mental confusion, coma or even death.

The agency’s notice doesn’t apply to smartwatch apps linked to sensors, such as continuous glucose monitoring systems that measure blood sugar directly.

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