The C-peptide, also called the connecting peptide, is a 31-amino-acid polypeptide. It is secreted by pancreatic beta cells and is used to assess beta-cell function. It is cleaved from proinsulin to make insulin. It has a longer half-life than insulin and is therefore considered a useful and relatively stable indicator of pancreatic insulin secretion. It is also a marker of endogenous insulin secretion. C–peptide can help differentiate between endogenous insulin and exogenous insulin, as injected insulin cannot contain C-peptide.
Clinical Significance of C – PEPTIDE and Interpretation:
C-peptide levels are clinically important in the diagnosis and management of several conditions, including:
- Assessment of pancreatic β-cell function:
C-peptide reflects the amount of insulin produced by the β-cell. It is particularly useful for determining residual β-cell function in patients. The key advantage is that C-peptide is a marker of endogenous insulin secretion. In contrast, an insulin measurement alone cannot consistently distinguish insulin produced by the pancreas from injected insulin.
- Differentiating Diabetes Types
This test is used to differentiate between Type 1 and Type 2 Diabetes. Type 1 diabetes is identified by low C–peptide levels, and Type 2 diabetes is identified by high levels of C–peptide.
- Chronic Kidney Disease (CKD)
As C–the kidneys excrete peptide, abnormal levels of it suggest Kidney dysfunction in the patient.
- Hypoglycemia
It is a condition in which an individual’s blood glucose levels drop. It may be due to excessive insulin production. C–peptide test assists in identifying this condition.
- It is very useful in the differential diagnosis of beta-cell tumors, insulinomas, and sulfonylurea therapy.
Different Diagnostic Ways to test for C-Peptide level:
Doctors recommend a C-Peptide test to measure the level of C-Peptide in human serum or plasma. Common laboratory methods for detecting C-Peptide levels include Chemiluminescence Immunoassay (CLIA), Enzyme-Linked Immunosorbent Assay (ELISA), Fluorescence Immunoassay (FIA), and Radioimmunoassay (RIA). The detection of C-Peptide levels is based on chemiluminescent immunoassay (CLIA) and is used for quantitative detection of C-Peptide in human serum and plasma.
Conclusion The C-peptide test is an important test for evaluating beta-cell function. C–peptide levels should always be interpreted alongside clinical history, glucose levels, HbA1c and other findings. Overall, C–peptide measurement provides important information for pancreatic function and can support more accurate diagnosis, classification and management of diabetes and other related disorders.
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