My brother has mental retardation and was diagnosed with diabetes just three months ago. He was using meter “S”, but complained about his finger hurting. So we bought meter “F” to test on his arm. The two meters seem to give very different readings at the same time, plus or minus 100 mg/dl�&nbsp&nbsp &nbsp � [5.6 mmol/L]. Is that normal or am I doing something wrong? What is the difference between plasma-calibrated results and whole blood?

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