What's this test for?

This test is ideal if you're experiencing unexplained blood sugar swings, unusual episodes of low blood sugar, or if you've been told you have diabetes but aren't sure which type. It's also useful if you've had a pancreas or islet cell transplant and need to check how well it's working. C-Peptide testing helps figure out how much insulin your body is naturally producing versus insulin coming from another source.

What's included in this test?

This test measures C-Peptide at four separate points, usually before and after a glucose challenge, so it can capture how your pancreas responds over time rather than just a single snapshot. Looking at multiple specimens matters because insulin and C-Peptide levels naturally rise and fall throughout a glucose tolerance test, and catching that pattern gives a much clearer picture of pancreatic function than one blood draw could.

What happens after I get my results?

Your results will show up in your online account, with each C-Peptide value explained alongside its normal range so you know exactly where you stand. Depending on your pattern of results, next steps might include adjusting meal timing, working on carbohydrate intake, or retesting after a few months to track changes. If any value comes back at a dangerously high or low level, it's important to seek medical care right away. You can also download a standard lab report anytime and use the trends feature to watch how your levels shift over multiple tests.

How can I naturally support healthy pancreatic function?

Eating balanced meals with fiber, protein, and healthy fats instead of large amounts of refined carbs can ease the workload on your pancreas. Regular physical activity helps your body use insulin more efficiently, which can reduce strain on insulin-producing cells. Getting consistent sleep and managing stress also play a role, since poor sleep and high stress hormones can affect blood sugar control. These habits support overall metabolic health but don't replace medical treatment if you have a diagnosed condition.

When will I get my results?

Results for this test are typically ready within about 7 days of your lab visit. Because this test involves four separate blood draws, the lab needs a little extra time to process each specimen and compile the full pattern. You'll get a notification as soon as your results are posted to your account.

Who should consider this test?

People who have been diagnosed with diabetes but want clarity on whether it's type 1 or type 2 are good candidates for this test. It's also a smart option for anyone with recurring low blood sugar episodes of unknown cause, or those monitoring a pancreas or islet cell transplant. People undergoing a glucose tolerance test who want a more detailed look at insulin production may also benefit.

What symptoms indicate I may need this test?

Watch for symptoms like shakiness, sweating, or confusion after eating or during fasting, which can point to low blood sugar episodes. Unexplained weight changes, extreme thirst, or frequent urination alongside high blood sugar readings are also signs worth investigating. If you've had a pancreas-related transplant and notice changes in your blood sugar control, that's another reason to consider this test.

What does high C-Peptide mean?

A high C-Peptide level usually means your pancreas is producing a lot of insulin, which can happen with insulin resistance, early type 2 diabetes, or in rarer cases an insulin-producing tumor. It can also show up if your kidneys aren't clearing C-Peptide as efficiently as they should. Simple next steps include reviewing your diet for excess sugar and refined carbs, increasing physical activity, and retesting to see if the pattern holds.

What does low C-Peptide mean?

A low C-Peptide level suggests your pancreas isn't making much insulin on its own, which is common in type 1 diabetes or in later-stage type 2 diabetes where the pancreas has become less active. It can also appear if someone is taking insulin from an outside source rather than producing it naturally. If your level is very low along with symptoms like high blood sugar, it's important to seek medical care promptly.

How often should I retest?

If you're actively managing a diabetes diagnosis or monitoring a transplant, retesting every few months can help track whether your pancreatic function is stable, improving, or declining. If you're investigating a one-time low blood sugar episode, your results and symptoms will guide whether a repeat test makes sense. Using the trends feature in your account makes it easy to compare results side by side over time.

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 - Diabetes Type 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 Panel

C-Peptide Response to Glucose, 4 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 Panel

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

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