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The C-Peptide (Serum) Test is a simple blood test that helps show how much insulin your body is making. You may also see it called a C peptide blood test, serum C peptide, or connecting peptide test. If your doctor ordered it, you can book at participating labs on LabFinder.
Some labs list it as fasting C peptide or C peptide level. C peptide is made at the same time as insulin. Measuring it helps your doctor see how well your pancreas makes insulin and if low or high sugar symptoms might be related to insulin levels.
Common reasons: checking how much natural insulin you make, helping tell the difference between type 1 and type 2 diabetes, looking into low blood sugar episodes, monitoring after starting insulin, or checking for rare insulin making growths.
You will check in and show your lab order. A staff member confirms if the sample should be fasting or timed after food or glucose. Your arm is cleaned and a small tube of blood is drawn. A bandage is placed and you can leave. Plan about 10 to 20 minutes at the site.
Yes, this is a quick, routine blood draw and is considered very safe. You might feel a quick pinch, notice a small bruise, or feel a little lightheaded for a moment afterward, but those effects usually fade quickly. Be sure to tell the staff if you take blood thinners, have a bleeding disorder, or if you have fainted during blood draws before. They will take extra care to keep you comfortable. If your doctor ordered a timed sample after glucose or a meal, tell the team if you feel shaky or unwell during the visit.
Follow timing instructions: your doctor may ask for a fasting sample or a sample after food or glucose. Ask about fasting: if fasting is needed, do not eat for 8 hours and drink water only. Stay hydrated: water helps the draw go smoothly. Bring a meds list: include insulin and pills for sugar control. Avoid hard workouts that morning: intense exercise can affect some results. Always follow any instructions from your doctor or the lab and bring your photo ID and order.
Type 1 diabetes, type 2 diabetes, low blood sugar from too much insulin, insulin resistance, problems with the pancreas, and recovery after a pancreas issue. Results need context. Your doctor will review them along with your story and symptoms before planning next steps.
You can compare locations, see time slots, and book online at participating labs. It is easy to search for a convenient location in your area or by city or ZIP. Coverage varies by plan and provider, so please confirm details with your insurance or the lab when you book.
Book on LabFinder: find a lab today on our lab finder and request a test doctor guided.
The information on this page and throughout the LabFinder website and mobile app is for general informational purposes only. It is not intended to serve as medical advice, diagnosis, or treatment. For personalized medical advice or specific health concerns, please consult your healthcare provider directly.
Booking a C-Peptide (Serum) Test is easy using LabFinder. Just choose your location and enter your insurance information to find the closest C-Peptide (Serum) Test near you.
To make a same-day appointment for a C-Peptide (Serum) Test, just choose your location and your insurance information to find the closest C-Peptide (Serum) Test location near you. If there's availability for a same-day appointment at a nearby lab location, then you will be able to book it easily through LabFinder.
LabFinder allows you to easily schedule a C-Peptide (Serum) Test. You can search by location and insurance to easily book a C-Peptide (Serum) Test near you.
LabFinder allows you to easily make an appointment for a C-Peptide (Serum) Test online. To make an appointment for a C-Peptide (Serum) Test online, just choose your location and your insurance information to find the closest C-Peptide (Serum) Test near you.
Yes, you can get a C-Peptide (Serum) Test without insurance. LabFinder allows you to search and select "Self-Pay" when booking a C-Peptide (Serum) Test. While pricing for the test may not be immediately available, please check by calling the lab company directly for pricing.
