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* This is not a home test kit. You will need to visit a local lab for testing.
Fasting Required: No
Turnaround Time: 2-7 business days
Specimen Type: Blood
Connecting Peptide Insulin, Insulin C-Peptide, Proinsulin C-Peptide
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 is produced in conjunction with insulin and is easier to measure, making it a reliable barometer for tracking insulin levels.
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.
A 12-hour fast is required before testing. You must also avoid alcohol for 24 hours prior to the test day.
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.
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.
Provider | LabCorp, Quest |
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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.
Based on 2,247 reviews subject to moderation
Very thankful for fast attention and the personnel were kind
Review of 3/15/2025, reflecting an experience on 3/12/2025 by Ana Maria W
Very customizable tests, approval from doctors within a couple horead more
Review of 3/13/2025, reflecting an experience on 3/10/2025 by Wassim E
Good service as always
Review of 3/8/2025, reflecting an experience on 3/5/2025 by THEODOROS T
Very professional and efficient.
Review of 3/6/2025, reflecting an experience on 2/28/2025 by Cory H
After some effort and doubts , I could get clarification and boread more
Review of 3/4/2025, reflecting an experience on 2/28/2025 by Visalam S
Easy and efficient.
Review of 2/21/2025, reflecting an experience on 2/18/2025 by Dan G
smooth and clean! :)
Review of 2/19/2025, reflecting an experience on 2/16/2025 by Shanker G
Quick, easy and they offer discounts on lab work. They are greatread more
Review of 2/18/2025, reflecting an experience on 2/14/2025 by Frankie B
Personal Labs is a great value and easy to use.
Review of 2/13/2025, reflecting an experience on 2/10/2025 by John B
good service
Review of 2/7/2025, reflecting an experience on 2/4/2025 by THEODOROS T
Great service
Review of 2/2/2025, reflecting an experience on 1/30/2025 by Mary S
I've been using them for years and with great success. I recommeread more
Review of 1/31/2025, reflecting an experience on 1/28/2025 by John C
It’s so easy to keep tabs on your health with Personalabs! So farread more
Review of 1/30/2025, reflecting an experience on 1/27/2025 by Danial W
I needed to cancel my order the next day and they haven’t respondread more
Review of 1/21/2025, reflecting an experience on 1/17/2025 by Jennifer R
Excellent service.
Review of 1/21/2025, reflecting an experience on 1/13/2025 by DIEGO R
Very thankful for fast attention and the personnel were kind
Review of 3/15/2025, reflecting an experience on 3/12/2025 by Ana Maria W
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Excellent service.
Review of 1/21/2025, reflecting an experience on 1/13/2025 by DIEGO R