--- title: Insulin, Fasting Test type: test id: insulin-fasting url: "https://www.test-well.com/tests/insulin-fasting" price_usd: 22.99 lab_fee_usd: 6 all_in_usd: 28.99 cpt: 83525 category: Diabetes & Blood Sugar sample: Blood draw fasting_required: true results_in: "2–4 business days" labs: - Quest - Labcorp - BioReference orderable: true reviewed_at: 2026-09-14 order_url: "https://www.test-well.com/cart?add=insulin-fasting&utm_source=ai_agent&utm_medium=markdown" --- # Insulin, Fasting Test > Detects insulin resistance early — often years before blood sugar becomes abnormal, measured from a standard blood draw. At TestWell it costs $22.99 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 Quest or Labcorp. ## Key facts | Fact | Value | | --- | --- | | Price | $22.99 + $6 lab processing fee per order ($28.99 all-in for this test alone) | | CPT code | 83525 | | Sample | Blood draw | | Fasting | Yes — 8–12 hours | | Results | 2–4 business days | | Labs | Quest Diagnostics, Labcorp, BioReference (NY & NJ) | | 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 Insulin, Fasting test tell you? Detects insulin resistance early — often years before blood sugar becomes abnormal. Fasting insulin measures how much insulin your pancreas is producing to keep blood sugar in range. Elevated fasting insulin is one of the earliest signs of insulin resistance, often appearing years before glucose or A1c levels become abnormal. This makes it a valuable early-detection tool for Type 2 diabetes risk and metabolic syndrome. **Clinical use:** Fasting insulin — the earliest marker of insulin resistance, often elevated 5-10 years before A1c rises. Paired with glucose to calculate HOMA-IR. ## Who should order it? Anyone with central obesity, PCOS, family history of type 2 diabetes, fatty liver, or doing a metabolic optimization workup. The most sensitive single marker of pre-diabetes physiology. ## Biomarkers measured - [Insulin](https://www.test-well.com/biomarkers/fasting-insulin) ## Price by lab | Lab | Test price | All-in (with $6 fee) | Notes | | --- | --- | --- | --- | | Quest Diagnostics | $22.99 | $28.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | Labcorp | $23.99 | $29.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | BioReference (NY & NJ) | $23.99 | $29.99 | New York and New Jersey orders route here automatically | 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 Insulin, Fasting test cost? A Insulin, Fasting test costs $22.99 at TestWell — $28.99 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 $130.00 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) | $22.99 | $28.99 | Includes the one $6 lab processing fee, charged once per order | | Hospital outpatient lab, self-pay (typical) | $130.00 | $130.00 | Reference figure; hospital charges vary widely by facility and are often higher | Lab test codes: Quest test code 561 · Labcorp test no. 004333 · BioReference code 1648-5. ## How do you prepare? Fasting for 8–12 hours is required. Water is okay. ## Related conditions - Insulin resistance (E88.81) - [Prediabetes](https://www.test-well.com/conditions/diabetes-screening) (R73.03) - [Type 2 diabetes](https://www.test-well.com/conditions/diabetes-screening) (E11.9) - [Polycystic ovary syndrome](https://www.test-well.com/conditions/pcos) (E28.2) - [Non-alcoholic fatty liver disease](https://www.test-well.com/conditions/fatty-liver) (K76.0) ## Is the Insulin, Fasting worth it? > Worth it if you want an early read on insulin resistance. Fasting insulin often rises years before glucose or A1c budge, so it can flag metabolic trouble early - but it is best interpreted alongside a fasting glucose, not on its own. ### Worth it if you… - Weight gain around the middle, PCOS, or a family history of type 2 diabetes - Normal A1c but ongoing metabolic concern (early insulin resistance) - Tracking a low-carb, weight-loss, or GLP-1 program at the metabolic level - Anyone who wants a fuller metabolic picture than glucose alone ### You can probably wait if you… - You just need standard diabetes screening - [A1c](https://www.test-well.com/tests/hemoglobin-a1c) or fasting glucose is the guideline test - You cannot fast reliably - a non-fasting insulin is hard to interpret ### At home or in the lab? At-home collection is available. Fasting insulin is a venous draw at Quest or Labcorp, or an at-home mobile draw where available, after 8-12 hours without food (water and medications are fine). Pair it with a fasting glucose from the same draw to calculate insulin resistance (HOMA-IR). ### How do you read the results? | Result | Typical adult range | What an out-of-range value can mean | | --- | --- | --- | | Fasting insulin | ~2-19 uIU/mL (lab range) | Many clinicians view single digits as more favorable; higher fasting insulin with normal glucose is an early sign of insulin resistance. Ranges vary widely by lab and assay. | | Paired with fasting glucose | Glucose 70-99 mg/dL | Insulin and glucose together (HOMA-IR) describe insulin resistance better than either number alone. | _This section medically reviewed; last reviewed 2026-06-20._ ## Common questions about the Insulin, Fasting test ### Why measure fasting insulin if my A1c is normal? A1c only rises after years of glucose regulation failure. Fasting insulin rises first — the pancreas pumps out more insulin to keep glucose normal. By the time A1c is elevated, insulin resistance has been brewing for 5-10 years. Catch it early with fasting insulin. ### How much does fasting insulin cost without insurance? TestWell charges $22.99 — vs $49 at Quest Direct and $80-$200 at hospital labs. ### Do I need to fast? Yes — strict 9-12 hours of fasting (water only). Insulin spikes within minutes of food intake; non-fasting results are uninterpretable. ### What's a healthy fasting insulin level? Conventional reference: 2-25 uIU/mL (huge range). Functional optimal: <8 uIU/mL. 8-15: early insulin resistance. >15: significant insulin resistance regardless of normal glucose. ### How do I calculate HOMA-IR? HOMA-IR = (Fasting Insulin × Fasting Glucose) / 405. <1.5 is optimal, 1.5-2.5 is borderline, >2.5 indicates insulin resistance. Order [Glucose](https://www.test-well.com/tests/glucose-basic) alongside and we'll show the calculation on your results page. ### Fasting insulin vs A1c - which tells me more? They answer different questions. [A1c](https://www.test-well.com/tests/hemoglobin-a1c) tells you your average blood sugar over 2-3 months and is the diabetes screening standard. Fasting insulin can reveal insulin resistance earlier, while A1c and glucose still look normal. For an early metabolic read, many people run both plus a fasting glucose. ### How long do I fast before an insulin test? Fast 8-12 hours (overnight is easiest); water and most medications are fine. Because insulin spikes after eating, a non-fasting result is difficult to interpret, so fasting matters more here than for many other tests. ### What is HOMA-IR and can I get it here? HOMA-IR is a simple calculation from your fasting insulin and fasting glucose that estimates insulin resistance. Order both from the same draw and the numbers let you (or your provider) compute it - a more informative metabolic read than glucose alone. ## How to order 1. Add to cart: https://www.test-well.com/cart?add=insulin-fasting&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 Quest Diagnostics, Labcorp, BioReference (NY & NJ) 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 - [Metabolic Lab Testing: Which Panel Do You Actually Need?](https://www.test-well.com/guides/metabolic-lab-testing) - [A1c Levels Explained: Normal Ranges, Prediabetes Cutoffs, and What Can Skew Your Number](https://www.test-well.com/guides/a1c-levels-explained) - [PCOS Panel](https://www.test-well.com/tests/pcos-panel) — 9 tests · $240.99 - [Diabetes Screening Panel](https://www.test-well.com/tests/diabetes-screening-panel) — 3 tests · $59.99 - [Pre-Diabetes Panel](https://www.test-well.com/tests/pre-diabetes-panel) — 5 tests · $89.99 - [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/insulin-fasting 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.