<qa>  What is the gold standard for intravenous glucose tolerance testing?An alternative diagnostic tool that has gained increasing attention and that is already routinely used in pediatric patients with diabetes mellitus type I is the continuous glucose monitoring system CGMS which was shown to be much more sensitive in detecting glucose abnormalities. To assess pancreatic endocrine dysfunction - the pathophysiologic cause for glucose intolerance - intravenous glucose tolerance testing IVGTT is the gold standard. 