Comment on: Besser et al. Lessons From the Mixed-Meal Tolerance Test: Use of 90-Minute and Fasting C-Peptide in Pediatric Diabetes. Diabetes Care 2013;36:195–201

It was extremely gratifying to read an interesting article in Diabetes Care by Besser et al. (1) that suggested that 90-min C-peptide is a highly sensitive and specific measure of area under curve and peak C-peptide in children and adolescents with type 1 diabetes and offers a practical alternative to a full mixed-meal tolerance test. The authors also suggested that C-peptide measured at diagnosis and age at diagnosis can be used to predict the time taken for patients to become insulin-deficient. The authors suggested that those with the lowest tertile of fasting C-peptide (<0.17 nmol/L) reached insulin deficiency quicker than those in the …