Apple has made notable progress on noninvasive blood glucose monitoring technology, according to a new report from Bloomberg's Mark Gurman. Planned as a future Apple Watch feature, Apple wants to use the function to allow diabetics and others to test their blood glucose levels without needing to prick the skin for blood testing.

To test glucose levels without blood, Apple is developing a silicon photonics chip that uses optical absorption spectroscopy to shine light from a laser under the skin to determine the concentration of glucose in the body. The technology is in a "proof-of-concept" stage that is viable, but needs to be condensed to a size that can fit into a wearable. At the current time, the prototype device is sized similarly to an iPhone and can be attached to a person's arm.

See https://www.macrumors.com/2023/02/22/apple-blood-glucose-monitoring-technology/

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