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 recently been diagnosed with diabetes and need to know 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. This test helps figure out how much insulin your body is naturally making versus insulin coming from another source.

What happens after I get my results?

Your results will be available in your account, with each C-peptide value explained alongside its normal range so you know exactly where you stand at each of the three collection points. If your levels are outside the expected range, simple next steps include adjusting meal timing, tracking symptoms around low blood sugar episodes, and retesting after any changes to diet or medication. A downloadable lab report is available in your account, and you can track your C-peptide levels over time using the trends feature to see how your body responds to glucose over multiple tests.

What symptoms indicate I may need this test?

Common signs include unexplained shakiness, sweating, or confusion that suggest low blood sugar, especially if these episodes happen without a clear cause. People recently diagnosed with diabetes who are unsure if it's type 1 or type 2 may also need this test. Sudden, unexplained weight changes combined with abnormal blood sugar readings are another reason to consider it.

How can I naturally support healthy insulin and glucose balance?

Eating balanced meals with protein, fiber, and healthy fats can help keep blood sugar and insulin levels steadier throughout the day. Regular physical activity, like walking after meals, helps your body use glucose more efficiently. Getting enough sleep and managing stress also play a big role, since poor sleep and high stress can throw off blood sugar control.

When will I get my results?

Results are typically ready within about 7 days of your lab visit. Because this test involves 3 separate specimens collected during a glucose challenge, all samples need to be processed together before your full result set is finalized. You'll get a notification as soon as your results are posted to your account.

Who should consider this test?

This test is a good fit for people with confusing or inconsistent blood sugar readings, those newly diagnosed with diabetes who want clarity on the type, and anyone being monitored after a pancreas or islet cell transplant. It's also useful for people experiencing hypoglycemia symptoms when the cause isn't clear. Anyone working with weight or metabolism changes tied to blood sugar issues may also benefit.

What is C-peptide and why does it matter?

C-peptide is a substance your body makes at the same time as insulin, in equal amounts, so measuring it tells you how much insulin your pancreas is actually producing on its own. This matters because it helps separate problems with your body's own insulin production from issues caused by outside insulin sources. It's a helpful clue in understanding what's really going on with your blood sugar control.

What does a high C-peptide result 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 certain rare insulin-producing tumors. It can also show up in people who are overweight or who eat a lot of refined carbohydrates. Simple steps include cutting back on sugary and processed foods, increasing activity, and retesting to see if levels improve.

What does a low C-peptide result 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 stages of type 2 diabetes where the pancreas has worn out. It can also appear if you're taking insulin injections, since injected insulin doesn't come with C-peptide. If your level is very low and you're having symptoms like extreme thirst or fatigue, it's important to seek medical care promptly.

How often should I retest?

If you're monitoring a transplant or working through a diabetes diagnosis, retesting every few months can help track how your pancreas function is changing. Once you have a stable picture, retesting once or twice a year is usually enough unless your symptoms change. Always retest sooner if you notice new or worsening blood sugar symptoms.

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 & Insulin 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 for Diabetes Evaluation

C-Peptide Response to Glucose, 3 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 happens after I get my results?

What symptoms indicate I may need this test?

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

Find a lab near you

C-Peptide Glucose Response Test for Diabetes Evaluation

Prescription & all lab fees included

Doctor's guidance included

Fast & convenient

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