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C-peptide.

J B Hoekstra, H J van Rijn, D W Erkelens

    Diabetes Care
    |July 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    C-peptide, a byproduct of insulin production, is measured in blood and urine to assess pancreatic B-cell function. Its levels help differentiate causes of hyperinsulinism and guide diabetes treatment.

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    Area of Science:

    • Biochemistry
    • Endocrinology
    • Clinical Chemistry

    Background:

    • C-peptide is a polypeptide derived from proinsulin cleavage in pancreatic B-cells.
    • It is secreted equimolarly with insulin and primarily cleared by the kidneys, with a small fraction excreted in urine.
    • C-peptide assays are crucial for evaluating B-cell function and insulin secretion.

    Purpose of the Study:

    • To provide a comprehensive overview of C-peptide's origin, secretion, metabolism, and measurement.
    • To discuss the clinical applications and research value of C-peptide measurements.
    • To highlight potential sources of error in C-peptide assays.

    Main Methods:

    • Radioimmunoassay (RIA) is the primary method for measuring C-peptide in serum and urine.
    • Glucagon is cited as a simple secretagogue for evaluating B-cell function.

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  • Analysis of assay limitations including standard, tracer, antiserum specificity, and C-peptide degradation.
  • Main Results:

    • C-peptide is secreted equimolarly with insulin and minimally extracted by the liver.
    • Kidney function significantly influences C-peptide clearance and urinary excretion.
    • Accurate C-peptide measurement requires careful consideration of assay-related errors.

    Conclusions:

    • C-peptide measurements are valuable for distinguishing endogenous from exogenous hyperinsulinism.
    • It aids in determining the necessity of insulin therapy in diabetic patients.
    • C-peptide is indispensable in clinical research for monitoring B-cell activity in diabetes.