If you have diabetes, you may use a blood glucose meter to routinely check your blood sugar at home -- but is it accurate? Depends on whether you think a 20 percent margin of error is precise or not. That's the margin allowed by international standards -- and by the U.S. Food and Drug Administration -- which worries some experts since inaccurate readings can set patients up to a host of potential problems, such as seizures, unconsciousness and coma.
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