Request A Test
My Account

National Leader in Affordable Direct to Consumer Lab Testing

1-888-732-2348 1-866-383-2766 español View Your Order

Find a Test

C-Peptide Blood Test

Connecting Peptide, Insulin C-Peptide, Proinsulin C-Peptide
Sample Report
Specimen Type: Blood


C-Peptide Blood Test

This test measures levels of C-Peptide in the blood.  C-Peptide is a byproduct of the creation of insulin by the pancreas.  Insulin is required to transport glucose (sugar) to the cells in the body.  As blood sugar increases, so does insulin production.  A measurement of the C-Peptide levels in the blood can indicate how much insulin the body is producing.  Because C-Peptide levels correspond only to insulin produced by the body, it can be a useful measurement for people who take insulin medication for Diabetes.  Type 2 diabetics often develop antibodies to insulin which make it difficult to accurately measure insulin levels.  In these cases, C-Peptide is a more accurate way to evaluate insulin production.

C-Peptide is often ordered when a person has recently been diagnosed with diabetes or to monitor treatment for diabetes.  It is also done when a person is experiencing recurring symptoms of low blood sugar or excess insulin production.  C-Peptide is often ordered with an Insulin Blood Test

Turnaround time for the C-Peptide, Blood (Serum) test is typically 1 business day.

Note: Result turn around times are an estimate and are not guaranteed. Our reference lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.


The C-Peptide, Blood (Serum) test requires fasting for 14-16 hours prior to blood collection.  The C-Peptide, Serum test is not intended to be used repeatedly to monitor treatment or therapy.  This test should be used to provide a single measure of C-Peptide levels.



Location Search

Visa MasterCard Amex Discover
Request a Test, LTD. is a BBB Accredited Business. Click for the BBB Business Review of this Medical Testing Companies in Brecksville OH
STD Test Specials

Test Specials

for the month of 



Take 14% off all testing.

Use coupon code ANNIV14 during checkout.

Offer expires December 14, 2016.


Cannot be applied to industry discounted prices, previous orders or tests not listed on our website. One coupon code per order. Coupon code expires at Midnight EST.