Figure 1. Calibration curve for the OneTouch UltraSmart glucose meter using a set of standard β-D-glucose solutions in 50 mM sodium citrate pH 4.8. Each standard was measured three times in random order. This meter is specific for glucose and offers a large dynamic range. The second-degree polynomial that offers the best fit through the data points and the corresponding correlation coefficient (R²) are shown. The dashed line represents a perfect correspondence between the actual and measured glucose concentration.