Lab test

C-Peptide, Blood Test

A C-peptide blood test measures C-peptide, a small protein released in equal amounts with insulin when the pancreas produces the hormone.

Typical price

From $198

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

A C-peptide blood test measures C-peptide, a small protein released in equal amounts with insulin when the pancreas produces the hormone. Because C-peptide stays in the blood longer than insulin and is not present in injected insulin, it gives a reliable picture of how much insulin the body is making on its own. The test helps distinguish type 1 from type 2 diabetes, investigate episodes of low blood sugar, evaluate insulinomas, and monitor beta-cell function after pancreatic surgery.

• C-Peptide A marker released with insulin that reflects the pancreas's own insulin production.

• People being evaluated for the type of diabetes they have
• Individuals with unexplained low blood sugar episodes
• Patients with a suspected insulin-producing tumor
• People being monitored after pancreatic surgery or injury
• Individuals with suspected insulin misuse

• Fasting is often required; follow the instructions included with your order
• Tell the phlebotomist if you use insulin or diabetes medications
• Timing relative to meals may matter; collect when advised
• Report any recent illness or stress, which can affect results

A low C-peptide level suggests the pancreas is producing little insulin, as seen in type 1 diabetes or advanced beta-cell failure. A high level indicates the body is making excess insulin and can occur with insulin resistance, type 2 diabetes, or an insulinoma. Levels are interpreted with glucose and clinical history. Discuss your C-peptide result and what it suggests about your insulin production with a healthcare provider.

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