On your lab requisition: Quest “TSH, Pregnancy” (test code 90896)
The short answer
Measures insulin production from the pancreas — distinguishes between Type 1 and Type 2 diabetes, measured from a standard blood draw. At TestWell it costs $29.99 plus a $6 lab processing fee, requires an 8–12 hour fast, and results post in 2–4 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Labcorp.
Hospital Lab
$150
cash pay
Other Labs
$35
+ lab fees
TestWell
$29.99
+ $6 lab processing fee
C-Peptide is a byproduct of insulin production released by the pancreas in equal amounts to insulin. Unlike insulin itself, C-Peptide is not affected by external insulin injections, making it the gold standard for measuring how much insulin your body is naturally producing. It is essential for differentiating Type 1 diabetes (low C-Peptide) from Type 2 (normal or high C-Peptide), and for assessing pancreatic beta cell function over time.
Diabetes and blood-sugar testing identifies insulin resistance, pre-diabetes, and diabetes early — when lifestyle changes still have the highest impact.
Adults with risk factors for diabetes: family history, overweight/obesity, sedentary lifestyle, prior gestational diabetes, or signs like increased thirst, fatigue, or unexplained weight changes.
Sample Type
Blood draw
Fasting
Required
Results In
2–4 business days
Performed At
Labcorp
Your C-Peptide results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 2–4 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you. Already have results? Analyze them with your AI assistant against our physician-reviewed ranges.
Fasting for 8–12 hours required.
A C-Peptide test costs $29.99 at TestWell — $35.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Hospital outpatient labs typically bill around $150.00 self-pay for the same test, and often more. With insurance, what you pay depends on your deductible and your plan's negotiated rate; TestWell's price is fixed before the draw and is HSA/FSA-eligible.
| Where you order | Price | One test, all-in | Notes |
|---|---|---|---|
| TestWell (drawn at Labcorp) | $29.99 | $35.99 | Includes the one $6 lab processing fee, charged once per order |
| Hospital outpatient lab, self-pay (typical) | $150.00 | $150.00 | Reference figure; hospital charges vary widely by facility and are often higher |
Lab test codes: Quest test code 90896 · Labcorp test no. 010108. Competitor prices are read from the linked public pages and re-checked regularly; the labs' sites may add taxes or change prices without notice.
Compare more: Quest Diagnostics price list · Labcorp price list · Quest vs Labcorp · Lab test price checker
Most C-Peptide results are available in 2–4 business days after your specimen arrives at the lab. You'll get an email the moment results are ready, with everything viewable in your TestWell portal.
Blood draw. Sample is collected at a Quest, Labcorp, or BioReference patient service center near you, or via at-home phlebotomy where available.
On TestWell, the C-Peptide is $29.99. Quest Direct lists comparable tests at $35. Walk-in hospital labs typically bill $150 or more without insurance. Insurance is not required — pay one all-in price.
Yes — fasting for 8–12 hours required. Following the prep instructions gives you the most accurate result.
The C-Peptide is available at Labcorp patient service centers nationwide. Order online at TestWell, pick your preferred lab, and we'll generate a digital requisition for the location closest to you.
The CPT code for a C-Peptide test is 84681. You can order it from TestWell for $29.99 — no doctor's visit or insurance required, with results in 2–4 business days.
The C-Peptide test is Quest Diagnostics test code 90896 ("TSH, Pregnancy"), Labcorp test number 010108 (CPT 84681). TestWell orders it under those codes for $29.99 at Quest or Labcorp — no doctor's visit or insurance required, results in 2–4 business days. Codes verified against the labs' catalogs in 2026.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
TestWell Price
$29.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
Better value: the Pre-Diabetes Panel
Save $34.96This test is part of the Pre-Diabetes Panel — 5 tests · 8 biomarkers for $89.99, $34.96 less than à la carte.
$89.99$124.95
5 tests · 8 biomarkers
Frequently ordered together
Customers who ordered C-Peptide also added these for a more complete health picture.
Not sure where to start?
C-Peptide
$29.99