--- title: BUN Test type: biomarker url: "https://www.test-well.com/biomarkers/bun" also_known_as: - bun - blood urea nitrogen - urea nitrogen category: Metabolic Health units: - mg/dL order_price_usd: 20.99 order_item: Basic Metabolic Panel order_url: "https://www.test-well.com/tests/basic-metabolic-panel" reviewed_at: 2026-09-05 --- # BUN > BUN is measured with a standard blood draw after an 8–12 hour fast. A typical reference range is 7.00 – 20.0 mg/dL. At TestWell it's $20.99 all-in as Basic Metabolic Panel, results in 1–3 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis. Also known as: bun, blood urea nitrogen, urea nitrogen. ## Key facts | Fact | Value | | --- | --- | | Units | mg/dL | | Sample | Blood draw | | Fasting | 8–12 hours | | Results | 1–3 business days | | Price | $20.99 | | Labs | Quest or Labcorp · BioReference in NY/NJ | ## What does BUN measure? Nitrogen waste from protein metabolism that your kidneys clear. A general kidney-function indicator. ## What is the normal range for BUN? | Population | Reference range | | --- | --- | | age 18+ | 7.00 – 20.0 mg/dL | Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them. ## What does a high BUN mean? Often reflects dehydration, high-protein diets, or reduced kidney function. ## What does a low BUN mean? Can reflect low-protein intake, liver disease, or overhydration. ## How do you get tested for BUN? | Order | Type | Price | Includes | | --- | --- | --- | --- | | [Basic Metabolic Panel](https://www.test-well.com/tests/basic-metabolic-panel) | Single test | $20.99 | This marker | ## Quest vs Labcorp vs BioReference | Lab | Available | Price | Notes | | --- | --- | --- | --- | | Quest Diagnostics | Yes | $20.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | Labcorp | Yes | $21.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | BioReference (NY & NJ) | Yes | $22.99 | New York and New Jersey orders route here automatically — state rules keep Quest and Labcorp from accepting self-ordered draws. | - [What a high BUN means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/bun/high) - [What a low BUN means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/bun/low) ## Common questions about BUN ### Do I need a doctor's order to test my bun? No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor. ### How long does it take to get BUN results? Most BUN results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal. ### How much does a BUN test cost? Our Basic Metabolic Panel starts at $20.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted. ### Do I need to fast before my BUN test? Yes — for the most accurate result, fast for 8–12 hours before your blood draw. Water is fine; coffee, food, and supplements are not. Your prep instructions will be included with your order. ### Which lab will process my BUN test? Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations. ## Sources - [Mayo Clinic](https://www.mayoclinic.org/tests-procedures/blood-urea-nitrogen/about/pac-20384821) - [MedlinePlus (NIH) — BUN (Blood Urea Nitrogen)](https://medlineplus.gov/lab-tests/bun-blood-urea-nitrogen/) ## Related biomarkers - [Glucose](https://www.test-well.com/biomarkers/glucose) - [Creatinine](https://www.test-well.com/biomarkers/creatinine) - [eGFR](https://www.test-well.com/biomarkers/egfr) - [ALT](https://www.test-well.com/biomarkers/alt) - [AST](https://www.test-well.com/biomarkers/ast) - [Alkaline Phosphatase](https://www.test-well.com/biomarkers/alkaline-phosphatase) - [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup) - [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter) - [All biomarkers](https://www.test-well.com/biomarkers) --- Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-05. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md Canonical page: https://www.test-well.com/biomarkers/bun 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.