Google is working on a wearable that could test diabetics' blood sugar levels

Google has filed a patent application for a wearable device that can test diabetics' blood sugar levels without the use of a needle.

The application, filed with the U.S. Patent & Trademark Office on Dec. 3, is for a wrist-worn device that uses pressurized gas to pierce the user's skin and draw in a "micro-emergence" of blood to be tested.

The device might not be for diabetics alone. The patent application notes that blood could be tested for various qualities, including hormone levels, proteins and enzymes, which could factor into various medical conditions.

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