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C-Peptide - CPEP

What does the C-Peptide - CPEP blood test mean? Get a free analysis of your blood test now. Here's what you get with our free analysis:

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The C-Peptide test measures the amount of C-peptide in the blood. C-peptide is a byproduct of insulin production and is released in equal amounts to insulin. This test is used to assess insulin production by the pancreas and can help differentiate between type 1 and type 2 diabetes. It's also useful in monitoring insulin production in diabetic patients, evaluating the cause of hypoglycemia, and assessing the function of pancreatic islet cell transplants. The test can provide insight into how much natural insulin a person's body is producing, which is particularly valuable in adjusting treatment plans for diabetic patients.

Acceptable Range:   0.8 to 4.0
Ideal for Women:   0.8-4.0
Ideal for Men:   0.8-4.0
Ideal for Girls:   0.8-4.0
Ideal for Boys:   0.8-4.0
Test Method: blood

What do readings below 0.8 ng/mL for C-Peptide - CPEP mean?

A low C-peptide level may indicate:

  1. Decreased insulin production by the pancreas
  2. Type 1 diabetes, where the body produces little to no insulin
  3. Advanced type 2 diabetes, where insulin production has significantly declined
  4. Use of exogenous insulin (insulin injections)
  5. Factitious hypoglycemia (intentional insulin overdose)

Low levels may require further investigation to determine the cause and potentially adjust diabetes management strategies.

What do readings above 4.0 ng/mL for C-Peptide - CPEP mean?

An elevated C-peptide level may indicate:

  1. Increased insulin production, often seen in type 2 diabetes or insulin resistance
  2. Insulinoma (insulin-producing tumor)
  3. Cushing’s syndrome
  4. Kidney disease, as C-peptide is cleared by the kidneys
  5. Certain medications that stimulate insulin production

High levels may suggest the need for lifestyle changes, medication adjustments, or further testing to identify the underlying cause and optimize treatment.

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