C-Peptide
$ 29.00
C-Peptide Blood Test
Low-Cost Insulin Production and Pancreatic Beta Cell Function Test
The C-Peptide Blood Test measures the level of C-peptide in the blood.
C-peptide is released by the pancreas when the body makes insulin. Because C-peptide is produced at the same time as natural insulin, it can help show how much insulin your body is making on its own.
This test may be useful for provider-directed diabetes follow-up, insulin production evaluation, low blood sugar evaluation, or monitoring pancreatic beta cell function.
✔ Measures C-peptide levels
✔ Helps evaluate natural insulin production
✔ Useful for diabetes-related follow-up
✔ May help assess pancreatic beta cell function
✔ Low-cost lab testing option
✔ Doctor's order included
✔ No insurance required
✔ Convenient online ordering
⏱ Typical turnaround: results are usually emailed in 1–3 days.
What Is C-Peptide?
C-peptide is a substance made when the pancreas produces insulin.
Insulin helps move glucose, also called blood sugar, from the bloodstream into the body's cells for energy.
When the pancreas makes insulin, it also releases C-peptide. Measuring C-peptide may help estimate how much insulin the pancreas is naturally producing.
What This Test Measures
This blood test measures the amount of C-peptide in the blood.
- Test name: C-Peptide Blood Test
- Also known as: Insulin C-Peptide Test, Connecting Peptide Test, Beta Cell Function Test
- Sample type: Blood
- Purpose: Measures C-peptide levels related to natural insulin production
- Common use: Insulin production, diabetes-related follow-up, and hypoglycemia evaluation when directed by a provider
Why Order a C-Peptide Blood Test?
A C-peptide test may be ordered when a person or healthcare provider wants more information about how much insulin the pancreas is producing.
This test may be considered for:
- Evaluating natural insulin production
- Diabetes-related follow-up testing
- Helping distinguish low insulin production from higher insulin production patterns
- Low blood sugar evaluation when directed by a provider
- Monitoring pancreatic beta cell function
- Evaluating insulin-treated patients when insulin levels alone may be difficult to interpret
- Customers who want low-cost direct access to lab testing without insurance
Low-Cost Insulin Production Testing
This C-peptide test is a practical and affordable way to access insulin production-related lab testing.
Since C-peptide reflects insulin made by your own pancreas, it may provide helpful information for people reviewing blood sugar concerns or diabetes-related treatment questions with their healthcare provider.
This can be a cost-saving option for customers who need this specific test without insurance billing.
Who May Consider This Test?
This test may be appropriate for:
- People whose healthcare provider requested C-peptide testing
- People with diabetes who need provider-directed insulin production evaluation
- People using insulin who need additional information about natural insulin production
- People being evaluated for unexplained low blood sugar
- People monitoring pancreatic beta cell function under medical guidance
- Customers who want low-cost lab testing without insurance billing
Common Reasons for Testing
- Diabetes-related follow-up
- Evaluating whether the pancreas is still producing insulin
- Provider-directed review of type 1 vs type 2 diabetes patterns
- Low blood sugar episodes
- Monitoring treatment decisions under medical guidance
- Evaluating insulin resistance or high insulin production patterns with other labs
- Follow-up after abnormal glucose, insulin, or A1c results
C-Peptide vs Insulin
Insulin and C-peptide are released by the pancreas at the same time when the body makes natural insulin.
C-peptide can be useful because injected insulin does not contain C-peptide. This means C-peptide may help show how much insulin your own pancreas is making, even if you use insulin medication.
For best interpretation, C-peptide is often reviewed with glucose, insulin, A1c, diabetes history, medication use, and symptoms.
Important: This Test Does Not Diagnose Diabetes by Itself
A C-peptide test can provide useful information about insulin production, but it is not used by itself to diagnose diabetes.
Diabetes screening and diagnosis usually involve tests such as fasting glucose, A1c, oral glucose tolerance testing, or other provider-directed testing.
Important Fasting and Timing Note
C-peptide results can be affected by when you last ate and your blood sugar level at the time of testing.
Your healthcare provider may request fasting C-peptide testing or testing with glucose, depending on the reason for the test.
Follow your provider's instructions or the lab's instructions before testing.
Important Biotin Warning
Biotin, also called vitamin B7, is commonly found in hair, skin, and nail supplements and may interfere with some lab tests.
If you take biotin or high-dose supplements, ask your healthcare provider whether you should stop taking it before testing.
Important Health Warning
If you have severe low blood sugar symptoms, confusion, fainting, seizure, chest pain, shortness of breath, severe weakness, vomiting, signs of diabetic ketoacidosis, very high blood sugar, severe dehydration, or any urgent medical concern, seek medical care promptly.
Do not use this test as a substitute for urgent medical evaluation, diagnosis, or treatment.
Screening and Lab Access Only
LabReqs and SchoolTiters provide access to lab testing. We do not diagnose diabetes, prescribe insulin, adjust diabetes medication, treat hypoglycemia, or manage blood sugar disorders.
This test may provide useful lab information, but results should be reviewed with a licensed healthcare provider, especially if you have diabetes, symptoms, abnormal glucose levels, or medication questions.
Important Limitations
- This test measures C-peptide only.
- This test does not include glucose, insulin, A1c, or diabetes antibodies unless ordered separately.
- This test does not diagnose diabetes by itself.
- C-peptide levels may be affected by fasting status, recent meals, glucose level, kidney function, medications, and medical conditions.
- A high or low C-peptide result must be interpreted with glucose level and clinical history.
- Do not start, stop, or change diabetes medication based only on this test result.
- If you have symptoms of severe high or low blood sugar, seek medical care promptly.
Before Ordering
- Confirm that you need a C-peptide blood test.
- If your provider requested fasting testing, follow their fasting instructions.
- If your provider requested glucose with C-peptide, make sure glucose is ordered separately if not included.
- Tell your healthcare provider about insulin use, diabetes medications, GLP-1 medications, sulfonylureas, kidney disease, and recent low blood sugar episodes.
- If your result is abnormal, review it with a licensed healthcare provider.
How It Works
- Order online.
- Receive your lab order. A doctor's order is included.
- Visit a participating lab location.
- Provide a blood sample.
- Receive your results. Review abnormal results with a healthcare provider.
Why Choose This C-Peptide Blood Test?
✅ Low-cost insulin production-related testing
✅ Helps evaluate natural insulin production
✅ Useful for provider-directed diabetes follow-up
✅ No insurance required
✅ Doctor's order included
✅ Convenient online ordering
✅ Results can be shared with your healthcare provider
Frequently Asked Questions
What does the C-Peptide Blood Test measure?
This test measures C-peptide, a substance released when the pancreas makes insulin.
Why is C-peptide useful?
C-peptide can help show how much insulin your body is making naturally because injected insulin does not contain C-peptide.
Can this test diagnose diabetes?
No. C-peptide does not diagnose diabetes by itself. Diabetes diagnosis usually requires glucose, A1c, or other provider-directed testing.
Is this test useful if I take insulin?
It may be useful because C-peptide reflects insulin made by your own pancreas, not insulin that is injected or taken as medication.
Should I order insulin with C-peptide?
Sometimes insulin, glucose, and C-peptide are reviewed together. Ask your healthcare provider which tests are appropriate for your situation.
Do I need to fast?
Fasting may be required depending on why the test is being ordered. Follow your healthcare provider's instructions or the lab's instructions.
What does a low C-peptide mean?
A low C-peptide may suggest that the pancreas is making little insulin, but it must be interpreted with glucose level, fasting status, medications, and medical history.
What does a high C-peptide mean?
A high C-peptide may suggest higher natural insulin production, but it can also be affected by insulin resistance, kidney function, medications, and other factors.
Is a doctor's order included?
Yes. A doctor's order is included with this lab test.
Order Your C-Peptide Blood Test
Use this low-cost test when you need convenient access to C-peptide testing for insulin production, pancreatic beta cell function, or provider-directed diabetes-related follow-up.
Order your C-Peptide Blood Test today.
C-Peptide
$ 29.00
