C-Peptide LIS Code: C-PEP

Understanding the Role of C‑Peptide, Insulin, and Glucose Testing
The combined measurement of C‑peptide, insulin, and glucose is essential in diagnosing and managing different forms of hypoglycaemia. These tests help distinguish between factitious hypoglycaemia and hypoglycaemia caused by excess insulin production (hyperinsulinism), ensuring accurate treatment and monitoring.

C‑Peptide as a Marker of Endogenous Insulin Secretion
C‑peptide testing provides a more accurate reflection of natural insulin production from the pancreas, particularly in insulin-treated diabetic patients. This is because high levels of anti-insulin antibodies can interfere with insulin measurements, while C‑peptide remains a reliable indicator of residual β‑cell activity.

When is C‑Peptide Measured?
C‑peptide levels are typically evaluated:

In a fasting state

During stimulation or suppression tests
These measurements help assess how much insulin the pancreas is still producing, which is crucial for proper diabetes classification and treatment planning.

Clinical Uses of C‑Peptide Testing

Early detection of Type 1 Diabetes Mellitus

Differentiation between Latent Autoimmune Diabetes in Adults (LADA) and Type 2 Diabetes

Monitoring the success of islet cell transplantation

Post-pancreatectomy monitoring to evaluate insulin function

Private C‑Peptide, Insulin, and Glucose Testing in Slough and Surrounding Areas
Specialist diagnostic services for C‑peptide, insulin, and glucose levels are available in Slough, Windsor, Maidenhead, and nearby Berkshire locations. These tests support early detection of diabetes subtypes, guide treatment decisions, and improve long-term management of hypoglycaemic and diabetic conditions.