Like thousands of other kids at summer camps across the country, James, 10, is making his first attempt on a climbing wall. Wearing a harness, and roped up to an experienced belayer, it takes him about two minutes to scramble to the top. He’s exuberant about the feat, and rappels down quickly, ready for another attempt.

But first, he rushes over to a nearby counselor: that would be me. “I think I might be low,” he says. James has diabetes, and wants to check his blood glucose level before his next climb. I hand him an alcohol wipe, a lancet, strip and a OneTouch® Ultra®2 Meter. Displaying the ease that most people would use to brush their teeth, he pricks his finger, inserts...

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