Need Help? (888) GET LABS

C-Peptide Blood Test

* This is not a home test kit. You will need to visit a local lab for testing.

Also Known As

Connecting Peptide Insulin, Insulin C-Peptide, Proinsulin C-Peptide

The Purpose of a C-Peptide Test

It’s vital to know how much insulin your body is (or isn’t) producing if you have diabetes, hypoglycemia, or a pancreatic tumor. Insulin is necessary to control your body’s blood sugar levels and prevent symptoms such as arrhythmia, dizziness, impaired vision, and fatigue. This is when a C-peptide lab test can help you.

C-Peptide, Serum (372)
C-Peptide, Serum (010108)

What Does the C-Peptide Lab Measure?

C-peptide is produced in conjunction with insulin and is easier to measure, making it a reliable barometer for tracking insulin levels.

Who Should Take a C-Peptide Test?

This test is often recommended for people who need a diagnosis of type 1 or type 2 diabetes or want to monitor the effectiveness of their diabetes treatment. It can also be used to help determine if someone has hypoglycemia or pancreatic cancer.

C-Peptide Testing Preparation

A 12-hour fast is required before testing. You must also avoid alcohol for 24 hours prior to the test day.

C-Peptide Blood Test Results

While there are some variations among labs, normal results generally range between 0.5 and 2.0 nanograms per milliliter. C-peptide levels below that range mean your insulin levels are insufficient. You may need further diabetes testing to further explore why your C-peptide labs are low.

Where Can I Get a C-Peptide Lab Test Near Me?

With more than 400 tests, Personalabs puts the power in your hands. You get the data and information you need to make the decisions that will transform your health. Our process is simple:

Step 1: Explore our test collections online, select the test(s) you want to purchase, and download the lab order. (A doctor won’t need to sign off on testing beforehand, depending on the state you live in.)

Step 2: Find the lab nearest you. We’re affiliated with top-tier companies Labcorp and Quest Diagnostics, giving you access to more than 4,000 labs across America.

Step 3: Bring the test order to the lab and have your blood drawn. (Remember, this test requires fasting.)

Step 4: Check your private Personalabs account within 2 to 10 business days after testing to review your results. And we know there are times when it’s crucial to get answers without a long wait, so reach out to us if you’d like us to contact the lab to deliver your test report by a specific date. Don’t forget that Personalabs offers comprehensive service, which includes telehealth visits with one of our board-certified physicians to discuss your results.

Shop our full range of tests today and discover how you can take the lead in transforming your health.

Additional information


LabCorp, Quest

Arrow icon


Order Your Test

Create an account, choose your tests, checkout securely, generate your lab order



Generate & Print Out Lab Order

Our physician network will approve your order within 2-4hrs.



Visit the Lab

The test price decides which lab you will visit: Quest or Labcorp. Find a location in your area.



Get Your Results

Results can be provided in as little as 24-48 hrs. For more complex tests, please contact us for turn around times.


Save up to
80% on meds!

We now offer pharmacy discounts through our PersonalabsRx platform.

We now offer pharmacy discounts through our PersonalabsRx platform.

Would you like to sign up for PersonalabsRx?