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Residual beta-cell function in children with IDDM: reproducibility of testing and factors influencing insulin

C Clarson, D Daneman, A L Drash

    Diabetes Care
    |January 1, 1987
    PubMed

    Insights

    C-peptide secretion is reproducible in children with diabetes. Higher C-peptide levels correlate with better diabetes control, including lower HbA1 and insulin needs.

    Area of Science:

    • Pediatric Endocrinology
    • Metabolic Disorders
    • Diabetes Research

    Background:

    • Assessing endogenous insulin production is crucial for managing type 1 diabetes.
    • C-peptide is a reliable marker of insulin secretion.
    • Understanding factors influencing C-peptide secretion aids in treatment strategies.

    Purpose of the Study:

    • To evaluate the reproducibility of C-peptide secretion in children with diabetes.
    • To investigate the effect of exogenous insulin on C-peptide levels.
    • To identify correlations between C-peptide secretion and glycemic control parameters.

    Main Methods:

    • Two Sustacal (mixed liquid meal) stimulation tests were performed 7-14 days apart to assess C-peptide secretion reproducibility.
    • Exogenous soluble insulin was administered subcutaneously before testing in a separate group to evaluate its effect.
    • Combined data from multiple groups (N=84) were analyzed for correlations.

    Main Results:

    • C-peptide secretion demonstrated good reproducibility between tests in C-peptide-positive children.
    • Peak C-peptide concentrations correlated inversely with HbA1, insulin dose, and diabetes duration.
    • Positive correlations were observed between peak C-peptide and age at diabetes onset.
    • C-peptide-positive children exhibited better glycemic control and lower insulin requirements.

    Conclusions:

    • C-peptide secretion is a reproducible measure in pediatric diabetes patients.
    • Higher C-peptide levels are associated with improved diabetes control indicators.
    • These findings support C-peptide as a valuable biomarker for assessing beta-cell function in children with diabetes.

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