Clarke error grids have become one of the most accepted methods of analyzing continuous glucose data. These grids are plots of the CGMS reading versus the reference value. Areas on the grid are constructed based on the clinical effects of each paired blood glucose. The paired glucose readings are thereby classified as in good agreement or erroneous with varying levels of clinical consequence. In order to identify inaccuracy based on the time delay of the CGMS we will randomly select one or two multiple hour time periods from each patient. We will compare plots of the CGMS readings with time shifted plots of the capillary or arterial blood glucose readings and attempt to obtain matches to identify the effect of the time delay. We will also analyze the effect of fluid loading and interstitial edema on the accuracy of the meters as well as the time delay.