--- title: Selenium Test type: test id: selenium url: "https://www.test-well.com/tests/selenium" price_usd: 64.99 lab_fee_usd: 6 all_in_usd: 70.99 cpt: 84255 category: Vitamins & Nutrients sample: Blood draw fasting_required: false results_in: "3–7 business days" labs: - Quest - Labcorp orderable: true reviewed_at: 2026-09-14 order_url: "https://www.test-well.com/cart?add=selenium&utm_source=ai_agent&utm_medium=markdown" --- # Selenium Test > Measures selenium — an antioxidant mineral important for thyroid function and immune health, measured from a standard blood draw. At TestWell it costs $64.99 plus a $6 lab fee, needs no fasting, and results post in 3–7 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp. ## Key facts | Fact | Value | | --- | --- | | Price | $64.99 + $6 lab processing fee per order ($70.99 all-in for this test alone) | | CPT code | 84255 | | Sample | Blood draw | | Fasting | Not required | | Results | 3–7 business days | | Labs | Quest Diagnostics, 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 Selenium test tell you? Measures selenium — an antioxidant mineral important for thyroid function and immune health. Selenium is a trace mineral that functions as a component of antioxidant enzymes and is essential for thyroid hormone metabolism, DNA synthesis, and immune function. Both deficiency and toxicity can cause health problems. Selenium levels vary by geographic region based on soil content. Testing is recommended for those with thyroid conditions, autoimmune disorders, or unexplained fatigue. **Clinical use:** Vitamin and nutrient testing identifies deficiencies that can drive fatigue, immune dysfunction, neurological symptoms, and long-term disease risk — and confirms that supplementation is working. ## Who should order it? Anyone with restrictive diets (vegan, low-fat, low-carb), malabsorption conditions, fatigue, hair loss, mood changes, or currently supplementing and wanting to verify dosing. ## Biomarkers measured - [Selenium](https://www.test-well.com/biomarkers/selenium) ## Price by lab | Lab | Test price | All-in (with $6 fee) | Notes | | --- | --- | --- | --- | | Quest Diagnostics | $64.99 | $70.99 | Choose at checkout; walk-in patient service centers nationwide (not NY/NJ) | | Labcorp | $77.99 | $83.99 | 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 Selenium test cost? A Selenium test costs $64.99 at TestWell — $70.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Ordered directly from the labs' own consumer sites, the same test lists at $109.00 at Labcorp OnDemand (list prices checked Sep 12, 2026). Hospital outpatient labs typically bill around $280.00 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) | $64.99 | $70.99 | Includes the one $6 lab processing fee, charged once per order | | Labcorp OnDemand (Labcorp's own site) | $109.00 | $109.00 | [list price checked 2026-09-12](https://www.ondemand.labcorp.com/lab-tests/selenium-test) | | Hospital outpatient lab, self-pay (typical) | $280.00 | $280.00 | Reference figure; hospital charges vary widely by facility and are often higher | Lab test codes: Quest test code 5507 · Labcorp test no. 081034. ## How do you prepare? No fasting required. ## Related conditions - Vitamin deficiency (E56.9) - Nutrient deficiency (E63.9) ## Common questions about the Selenium test ### How long do Selenium results take? Most Selenium results are available in 3–7 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 Selenium? 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 Selenium cost without insurance? On TestWell, the Selenium is $64.99. Quest Direct lists comparable tests at $109. Walk-in hospital labs typically bill $280 or more without insurance. Insurance is not required — pay one all-in price. ### Do I need to fast before the Selenium? No fasting required for the Selenium. No fasting required. ### Where can I get the Selenium done? The Selenium is available at Quest and 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=selenium&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 patient service center — no appointment needed at most sites. 5. Results post to your TestWell portal in 3–7 business days with reference ranges and flags. ## Related - [Vitamin & Mineral Deficiency Panel](https://www.test-well.com/tests/vitamin-mineral-panel) — 9 tests · $189.99 - [Men's Hair Health Panel](https://www.test-well.com/tests/mens-hair-health-panel) — 19 tests · $499.99 - [Women's Hair Health Panel](https://www.test-well.com/tests/womens-hair-health-panel) — 19 tests · $469.99 - [Biotin (Vitamin B7)](https://www.test-well.com/tests/biotin) — $259.99 - [Calcium](https://www.test-well.com/tests/calcium) — $26.99 - [Copper](https://www.test-well.com/tests/copper) — $31.99 - [CoQ10 (Coenzyme Q10)](https://www.test-well.com/tests/coq10-coenzyme-q10) — $74.99 - [Folate (Vitamin B9)](https://www.test-well.com/tests/folate) — $32.99 - [All Vitamins & Nutrients tests](https://www.test-well.com/tests/category/vitamins-nutrients) - [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/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.