Task: Answer Verification
Input (English): Question: Is fasting serum C-peptide useful for initial classification of diabetes mellitus in children and adolescents?
Answer: In this study, we found that if the C-peptide level was <0.6 ng/mL at diagnosis, T2DM could be excluded; if C-peptide level was >3.0 ng/mL, a T1DM diagnosis is unlikely. This finding suggests that serum fasting C-peptide level is useful for classifying DM type at the time of diagnosis in youth.
Output (English): yes