Figure 4: A) Scatterplot of the label free SPR-arrays vs. fluorescence arrays. Plotting the two array-based methods show acceptable agreement between methods with a correlation of r = 0.89. B) Scatterplot of the fluorescence arrays vs. ELISA. Plotting the fluorescence arrays against ELISA show less agreement with a lower correlation then between the array-based platforms (r = 0.66). C) Scatterplot of the SPR-based arrays vs. ELISA. The SPR-based arrays and ELISA also show less agreement between platforms then the two array-based platforms (r = 0.76). D) Separation of the deficient samples from non-deficient. Boxplots of the two groups of samples show satisfactory separation between groups for the label-free detection method as well.