Implementing a Reference Measurement System for C-Peptide: Successes and Lessons Learned.

Area of Science:

• Endocrinology and Metabolism
• Clinical Chemistry
• Biomedical Standardization

Background:

• C-peptide concentration is a key indicator of endogenous insulin secretion.
• Preserving even minimal C-peptide production in type 1 diabetes patients is linked to reduced complication risks.
• Standardizing C-peptide measurements is essential for comparing research data and clinical laboratory results across different sites and assays.

Purpose of the Study:

• To review the process and challenges of harmonizing and standardizing C-peptide measurements.
• To outline global initiatives aimed at establishing a reference measurement system for C-peptide.
• To propose a traceability scheme and suggest improvements for future standardization efforts.

Main Methods:

• Review of ongoing international harmonization efforts for C-peptide assays.
• Description of challenges in implementing a reference measurement system.
• Proposal of a traceability scheme for C-peptide measurements.

Main Results:

• Multiple global initiatives are actively working on C-peptide harmonization (e.g., US, Japan, UK, China).
• Challenges in standardization include assay variability and the need for a robust reference system.
• A proposed traceability scheme and recommendations for enhanced collaboration are presented.

Conclusions:

• International collaboration is vital for successful C-peptide measurement harmonization.
• Standardized C-peptide measurements will improve the reliability of diabetes research and clinical practice.
• The proposed framework aims to facilitate accurate and comparable C-peptide results globally.