C-peptide measured after a meal (serum/plasma)

Why This Test Is Done

Doctors may order a meal-timed C-peptide test to check how well your pancreas produces insulin after eating. It helps diagnose or monitor conditions like type 1 or type 2 diabetes, insulin deficiency, or pancreatic disorders. Unlike fasting tests, this measures insulin secretion in response to a meal, giving a clearer picture of how your body processes food.

What to Expect Before the Test

You’ll likely fast for a short period before the test, then eat a standard meal. Blood will be drawn at specific times afterward to measure C-peptide levels. Your doctor will guide you on preparation to ensure accurate results.

How the Test Works

After eating, your pancreas releases C-peptide, a byproduct of insulin production. Blood samples are taken at intervals to track its levels. The test measures how your body naturally produces this marker, reflecting real-time insulin function.

What the Results Mean

Results help determine if your pancreas is functioning normally or if insulin production is impaired. Low levels may suggest insulin deficiency, while normal or high levels can indicate healthy secretion or other conditions like pancreatic disease.