What's this test for?

This test is ideal if you're experiencing unexplained blood sugar swings, have been newly diagnosed with diabetes, or need to figure out whether your body still makes its own insulin. It's also useful if you've had episodes of low blood sugar (hypoglycemia) that haven't been explained, or if you've had a pancreas or islet cell transplant and need to check how well it's working. This test tracks how your insulin-producing cells respond over time after a glucose challenge, giving a clearer picture than a single blood sugar reading.

What's included in this test?

This is a single-analyte test that measures C-Peptide at six separate timed intervals during a glucose tolerance test. Because C-Peptide is released in equal amounts alongside your body's own insulin, tracking it at multiple time points shows how well your pancreas responds to and clears glucose over the full testing window, which is more informative than a one-time snapshot.

What happens after I get my results?

Your results will show up in your account with each of the six timed measurements explained alongside its normal range, so you can see how your body responded at every stage. Depending on the pattern, next steps might include adjusting carbohydrate intake, increasing physical activity, or retesting if your provider recommended a follow-up glucose tolerance check. A standard lab report is available to download directly from your account for your records. You can also use the trends feature to compare this result against future tests and watch how your pancreatic function changes over time.

How can I naturally support healthy insulin and blood sugar function?

Eating balanced meals with fiber, protein, and healthy fats instead of large amounts of refined carbs can help reduce the workload on your pancreas. Regular movement, especially after meals, helps your muscles use glucose more efficiently and takes pressure off insulin-producing cells. Getting consistent sleep and managing stress also matter, since poor sleep and high cortisol can worsen blood sugar control. Staying at a healthy weight is one of the most effective ways to support long-term pancreatic function.

When will I get my results?

Results are typically ready within about 7 days of your sample collection. You'll get a notification once they're posted to your account, where you can view each of the six timed measurements along with an explanation of what they mean.

Who should consider this test?

This test is a good fit for people recently diagnosed with diabetes who want to know whether it's type 1 or type 2, people with unexplained low blood sugar episodes, and anyone recovering from a pancreas or islet cell transplant who needs to track how well it's functioning. It's also useful if a routine glucose tolerance test needs a more resistant marker to confirm the results.

What symptoms indicate I may need this test?

Signs like frequent shakiness, sweating, or confusion between meals can point to unexplained low blood sugar. Unexplained weight loss, excessive thirst, or fatigue alongside high blood sugar readings can suggest your pancreas isn't producing insulin properly. If you've noticed big swings between very high and very low blood sugar, that's another reason this test might help clarify what's going on.

What is C-Peptide and why does it matter?

C-Peptide is a small protein your body releases in equal amounts to insulin whenever your pancreas makes its own insulin. Because it's more stable in a blood sample than insulin itself, measuring it tells you how much insulin your body is actually producing, separate from any insulin you might be taking as medication. This distinction is key for figuring out the type of diabetes you have or the cause of low blood sugar episodes.

What does a high or low C-Peptide result mean?

A high C-Peptide level generally means your pancreas is producing more insulin than usual, which can happen with insulin resistance, certain tumors, or early type 2 diabetes. A low level can suggest your pancreas isn't making enough insulin, which is common in type 1 diabetes or after significant pancreatic damage. Either pattern is easier to interpret when looked at across the six timed measurements rather than a single value.

What should I do if my results are abnormal?

If your results show an unusual pattern, start by reviewing the detailed explanation in your report to understand which time points were out of range. Small dietary and activity adjustments can help if the pattern points toward insulin resistance, while a significantly low or erratic result may call for retesting or additional bloodwork to pin down the cause. If you experience severe symptoms like fainting or extreme confusion related to blood sugar swings, seek medical care right away.

Getting your blood test with us is easy, private & backed by the power of science.Long story short: In the test options, use the filters or search box to narrow your choices and find the test you want. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy! If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

How do I know which test to get?

In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option. Just text or call us at 754-799-7833, email us at support@privatemdlabs.com, and we'll gladly help you. We've got your back and reply quickly.

When will my lab results be available?

Most test results will be available within 1–3 business days. Once they're ready, we'll send an email and text message to let you know. After your blood draw, just hang tight and don't worry – we'll keep you updated and in the loop! If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com, and we'll gladly help you.

Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?

Absolutely! We totally understand that errors can happen. No worries, we're here to help you. Just reach out to us via text at 754-799-7833 or shoot us an email at support@privatemdlabs.com. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you. There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out. Our lab requires an address to be listed to generate an order.

Do you accept health insurance?

Only HSA & FSA is accepted. Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts. This policy applies to all insurance companies, including federal health insurance programs like Medicare. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com.

Can I cancel my order?

Yes. We get it – sometimes your needs change. As long as your samples haven’t been collected yet, we’re happy to help you cancel your order. If you have any further questions, please text us at 754-799-7833 or email support@privatemdlabs.com. You can read more about our cancellation policy here.

How can I find a lab location near me?

During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp). Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym. If you have any questions, please text us at 754-799-7833 or email support@privatemdlabs.com and we'll gladly help you.

C-Peptide Glucose Response Test - Pancreas Function Check

Getting your blood test with us is easy, private & backed by the power of science.

Long story short:

In the test options, use the filters or search box to narrow your choices and find the test you want.
If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!

754-799-7833

[email protected]

C-Peptide Glucose Response Test — Diabetes Type Check

C-Peptide Response to Glucose, 6 Specimens

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

What's this test for?

What's included in this test?

What happens after I get my results?

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

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C-Peptide Glucose Response Test — Diabetes Type Check

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

1,000,000+ blood tests later, here's what our customers say