C-Peptide, Blood Test

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About Our C-Peptide, Blood Test

The C-Peptide blood test helps evaluate how much insulin your body is producing naturally by measuring C-peptide, a substance released in equal amounts to insulin. This makes it a powerful tool for understanding blood sugar imbalances and identifying whether insulin levels are too low, too high, or appropriately regulated.

Because injected insulin does not contain C-peptide, this test is especially valuable for individuals who use insulin medication, allowing clinicians to distinguish between insulin made by the body and insulin taken externally. It is commonly used to investigate the underlying causes of abnormal blood sugar levels and to support accurate diagnosis and treatment planning.

What Is Included In This Test?

This test measures the level of C-peptide in your blood, which directly reflects how much insulin your pancreas is producing.

Your results can help:

Assess pancreatic insulin production
Differentiate between type 1 and type 2 diabetes
Identify causes of low blood sugar (hypoglycemia)
Evaluate excessive insulin production
Guide treatment decisions for blood sugar disorders

Because insulin and C-peptide are released together when insulin is made naturally, this test provides a clear and reliable picture of endogenous insulin activity.

Who Should Consider This Test?

This test is ideal for individuals who need deeper insight into insulin production and blood sugar regulation.

You may benefit from this test if you:

Experience unexplained low or high blood sugar levels
Have diabetes and want to evaluate natural insulin production
Use insulin therapy and need to distinguish between injected and body-produced insulin
Are being evaluated for hypoglycemia or hyperglycemia
Need diagnostic clarification for a blood sugar or pancreatic disorder

Early and accurate assessment can support more targeted treatment and better long-term metabolic outcomes.

Convenient, No-Appointment Testing

To complete your test:

Order online through our website
Use the lab locator to find a nearby testing location
Walk in; no appointment required
Access your results securely in your HealthLabs.com account within one to three business days

110% Price Guarantee!

If you find the same test for a lower price from a comparable provider, contact us. We not only match the price, we beat it by an additional 10 percent of the difference.

Common Questions:

Why is C-peptide important?

C-peptide reflects insulin made by your pancreas, making it useful for evaluating insulin production and blood sugar regulation.

How is this test different from an insulin test?

Unlike insulin tests, C-peptide testing can distinguish between insulin your body produces and insulin taken as medication.

Will anyone see my results besides me?

Your results are stored in your secure online account. They are not shared with anyone else. If you choose, you can print or download them to share with your own doctor.

Do I need to fast before this test?

Fasting is not required for this panel. You can eat and drink normally unless your doctor has given you other instructions.

Can I talk to someone about my results?

Yes. If your results come back abnormal or if you simply have questions, our team is here to support you. You can text our Patient Services team at 1800-579-3914, anytime between 8am and 8pm.

Can I use insurance to pay for this test?

In order to ensure your privacy, we do not bill insurance directly, but you may use HSA or FSA funds. This keeps your results and testing completely private from insurers. We can also provide you with an itemized receipt for insurance reimbursement purposes if you need it.