How many hours does it take to get the results of a C-peptide test?

C-peptide test results are typically available within 3 to 4 hours, although the exact time may vary depending on the region and hospital.

C-peptide, also known as connecting peptide, reflects pancreatic islet function and plays an important role in diagnosing and differentiating conditions such as islet dysfunction, diabetes, and hypoglycemia. Results from a C-peptide test usually take about 3 to 4 hours. However, if the local hospital is a tertiary facility or uses relatively outdated testing equipment, result turnaround may be delayed, potentially taking around 4 hours.

Conversely, if the hospital has advanced equipment and fewer patients undergoing testing, results may be available more quickly—around 3 hours. The actual time required depends on individual circumstances. To improve the accuracy of C-peptide test results, tests are generally performed at fixed times, along with glucose tolerance tests or fasting assessments.

In addition, during the C-peptide test, individuals should avoid strenuous exercise, as this could stimulate excessive insulin secretion and affect blood glucose levels.