--- title: Selenium Test type: biomarker url: "https://www.test-well.com/biomarkers/selenium" also_known_as: - selenium - se category: Metabolic Health units: - mcg/L - ug/L order_price_usd: 64.99 order_item: Selenium order_url: "https://www.test-well.com/tests/selenium" reviewed_at: 2026-09-05 --- # Selenium > Selenium is measured with a standard blood draw; no fasting is needed. A typical reference range is 70.0 – 150 mcg/L. At TestWell it's $64.99 all-in as Selenium, results in 3–7 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis. Also known as: selenium, se. ## Key facts | Fact | Value | | --- | --- | | Units | mcg/L / ug/L | | Sample | Blood draw | | Fasting | Not required | | Results | 3–7 business days | | Price | $64.99 | | Labs | Quest or Labcorp | ## What does Selenium measure? An antioxidant trace mineral important for thyroid function and immune health. ## What is the normal range for Selenium? | Population | Reference range | | --- | --- | | age 18+ | 70.0 – 150 mcg/L | 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 low Selenium mean? Can reflect malabsorption or low-selenium diets in certain regions. ## How do you get tested for Selenium? | Order | Type | Price | Includes | | --- | --- | --- | --- | | [Selenium](https://www.test-well.com/tests/selenium) | Single test | $64.99 | This marker | | [Vitamin & Mineral Deficiency Panel](https://www.test-well.com/tests/vitamin-mineral-panel) | Panel | $189.99 | 9 tests | | [Women's Hair Health Panel](https://www.test-well.com/tests/womens-hair-health-panel) | Panel | $469.99 | 19 tests | | [Total Body Panel](https://www.test-well.com/tests/total-body-panel) | Panel | $499.99 | 49 tests | | [Men's Hair Health Panel](https://www.test-well.com/tests/mens-hair-health-panel) | Panel | $499.99 | 19 tests | ## Quest vs Labcorp vs BioReference | Lab | Available | Price | Notes | | --- | --- | --- | --- | | Quest Diagnostics | Yes | $64.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | Labcorp | Yes | $77.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. | | BioReference (NY & NJ) | No | — | Not available in NY/NJ for this test. | - [What a low Selenium means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/selenium/low) ## Common questions about Selenium ### Do I need a doctor's order to test my selenium? 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 Selenium results? Most Selenium 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 Selenium test cost? Our Selenium starts at $64.99. 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 Selenium test? Fasting is not required for the Selenium test. You can have your blood drawn any time of day. ### Which lab will process my Selenium 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 Labs](https://www.mayocliniclabs.com/test-catalog/overview/82382) - [NIH Office of Dietary Supplements — Selenium fact sheet](https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/) ## 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) - [BUN](https://www.test-well.com/biomarkers/bun) - [ALT](https://www.test-well.com/biomarkers/alt) - [AST](https://www.test-well.com/biomarkers/ast) - [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/selenium 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.