--- title: C-Peptide Test type: test id: c-peptide url: "https://www.test-well.com/tests/c-peptide-test" price_usd: 29.99 lab_fee_usd: 6 all_in_usd: 35.99 cpt: 84681 category: Diabetes & Blood Sugar sample: Blood draw fasting_required: true results_in: "2–4 business days" labs: - Labcorp orderable: true reviewed_at: 2026-09-14 order_url: "https://www.test-well.com/cart?add=c-peptide-test&utm_source=ai_agent&utm_medium=markdown" --- # C-Peptide Test > 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 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. ## Key facts | Fact | Value | | --- | --- | | Price | $29.99 + $6 lab processing fee per order ($35.99 all-in for this test alone) | | CPT code | 84681 | | Sample | Blood draw | | Fasting | Yes — 8–12 hours | | Results | 2–4 business days | | Labs | Labcorp | | Biomarkers measured | 1 | | Physician authorization | Included — no doctor's visit, referral or insurance needed | | Payment | Card, HSA or FSA; cash-pay only (no insurance billing) | ## What does the C-Peptide test tell you? Measures insulin production from the pancreas — distinguishes between Type 1 and Type 2 diabetes. 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. **Clinical use:** Diabetes and blood-sugar testing identifies insulin resistance, pre-diabetes, and diabetes early — when lifestyle changes still have the highest impact. ## Who should order it? 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. ## Biomarkers measured - [C-Peptide](https://www.test-well.com/biomarkers/c-peptide) ## Price by lab | Lab | Test price | All-in (with $6 fee) | Notes | | --- | --- | --- | --- | | Labcorp | $29.99 | $35.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | Rhode Island is not served. Prices are identical online and in the lab; no draw fee or physician fee is added. ## How much does a C-Peptide test cost? 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 Quest or 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. ## How do you prepare? Fasting for 8–12 hours required. ## Related conditions - [Type 2 diabetes mellitus](https://www.test-well.com/conditions/diabetes-screening) (E11.9) - Prediabetes (R73.03) ## Common questions about the C-Peptide test ### How long do C-Peptide results take? 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. ### What sample is collected for the C-Peptide? Blood draw. Sample is collected at a Quest, Labcorp, or BioReference patient service center near you, or via at-home phlebotomy where available. ### How much does the C-Peptide cost without insurance? 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. ### Do I need to fast before the C-Peptide? Yes — fasting for 8–12 hours required. Following the prep instructions gives you the most accurate result. ### Where can I get the C-Peptide done? 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. ## How to order 1. Add to cart: https://www.test-well.com/cart?add=c-peptide-test&utm_source=ai_agent&utm_medium=markdown 2. Create an account or sign in, confirm your state and preferred lab, pay by card, HSA or FSA. 3. A licensed physician authorizes the order (usually within minutes); the requisition arrives by email. 4. Walk into any Labcorp patient service center — no appointment needed at most sites. 5. Results post to your TestWell portal in 2–4 business days with reference ranges and flags. ## Related - [Pre-Diabetes Panel](https://www.test-well.com/tests/pre-diabetes-panel) — 5 tests · $89.99 - [Total Body Panel](https://www.test-well.com/tests/total-body-panel) — 49 tests · $499.99 - [Glucose](https://www.test-well.com/tests/glucose-basic) — $14.99 - [All Diabetes & Blood Sugar tests](https://www.test-well.com/tests/category/diabetes-blood-sugar) - [Full test directory](https://www.test-well.com/tests/directory) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-14. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/tests/c-peptide-test Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.