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Comparison of whole-blood glucose meters and plasma glucose measurements. The regression line obtained when comparing glucose values obtained using the AlphaTRAK® (top panel) or the Accu-Chek Advantage (middle panel) whole-blood glucose monitors and plasma glucose values obtained using an enzymatic assay does not intersect the y-axis at zero. Comparison of glucose values obtained with each monitor (bottom panel) shows that the regression line also does not intersect the y-axis at zero.
