C-peptide (Serum or Plasma) - Quantitative

Why Is This Test Done?

Your healthcare provider may order a C-peptide test to check if your body produces enough insulin. It can help diagnose type 1 or type 2 diabetes, monitor insulin production in people with diabetes, or evaluate the effectiveness of treatments like insulin therapy. It’s also useful in cases where insulin levels might be misleading due to external factors like insulin injections.

How Is the Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to measure the C-peptide concentration. The test is typically done on serum or plasma, depending on the lab’s protocol.

What Does the Test Result Mean?

C-peptide levels can vary based on your health and medical history. High levels may suggest overproduction of insulin, while low levels could indicate insufficient insulin production. Your results will be interpreted by your healthcare provider in the context of your overall health and symptoms.

Common Reasons for Testing

A C-peptide test is often used to distinguish between type 1 and type 2 diabetes, especially in cases where insulin levels alone might not provide enough information. It can also help assess insulin resistance or rule out other conditions affecting blood sugar regulation.