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http://www.lifeclinic.com/focus/diabetes/finger.asp

Finger-Stick Testing

This is a do-it-yourself test using a blood glucose meter that measures your blood sugar at the time you test. It's necessary to 'stick' yourself to obtain blood for the test. Because it's hard for people to take blood samples, scientists are studying ways to get a blood sample without a skin puncture. Infrared light is being looked at and so is measuring glucose through saliva or tears. There's also a possibility that sweat can be drawn through the skin using a low-level electrical current.