Finding less painful and more efficient ways to draw blood is a holy grail for medical entrepreneurs.

Seventh Sense Biosystems, a start-up based in Massachusetts, is among the furthest along in this quest. This year, the U.S. Food and Drug Administration approved its TAP device for use in hemoglobin A1C testing.

The company claims that its device is virtually painless, so I opted to give it…
Health Care

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