The short answer
Measures biotin levels — important for hair, skin, nail health, and metabolism, measured from a standard blood draw. At TestWell it costs $259.99 plus a $6 lab processing 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.
TestWell Price
$259.99
+ $6 lab processing fee
Biotin (vitamin B7) is a water-soluble B vitamin involved in fatty acid synthesis, glucose metabolism, and amino acid metabolism. It's widely taken as a supplement for hair, skin, and nail health. Important note: biotin supplementation can interfere with many other blood tests (including thyroid, cardiac, and hormone tests), so it should be discontinued before lab work.
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.
Anyone with restrictive diets (vegan, low-fat, low-carb), malabsorption conditions, fatigue, hair loss, mood changes, or currently supplementing and wanting to verify dosing.
Sample Type
Blood draw
Fasting
Not required
Results In
3–7 business days
Performed At
Quest
1 biomarker tested
Your Biotin (Vitamin B7) results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 3–7 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you. Already have results? Analyze them with your AI assistant against our physician-reviewed ranges.
Stop biotin supplements at least 72 hours before testing.
What can throw off this result
Physician-reviewed “Before your test” pages — what each factor does, for how long, and what to do about it.
A Biotin (Vitamin B7) test costs $259.99 at TestWell — $265.99 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 $79.00 at Quest Health and $79.00 at Labcorp OnDemand (list prices checked Sep 12, 2026). Hospital outpatient labs typically bill around $200.00 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) | $259.99 | $265.99 | Includes the one $6 lab processing fee, charged once per order |
| Quest Health (Quest Diagnostics' own site) | $79.00 | $79.00 | list price checked Sep 12, 2026 |
| Labcorp OnDemand (Labcorp's own site) | $79.00 | $79.00 | list price checked Sep 12, 2026 |
| Hospital outpatient lab, self-pay (typical) | $200.00 | $200.00 | Reference figure; hospital charges vary widely by facility and are often higher |
Lab test codes: Quest test code 391. Competitor prices are read from the linked public pages and re-checked regularly; the labs' sites may add taxes or change prices without notice.
Compare more: Quest Diagnostics price list · Labcorp price list · Quest vs Labcorp · Lab test price checker
Most Biotin (Vitamin B7) 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.
Blood draw. Sample is collected at a Quest, Labcorp, or BioReference patient service center near you, or via at-home phlebotomy where available.
On TestWell, the Biotin (Vitamin B7) is $259.99. Quest Direct lists comparable tests at $79. Walk-in hospital labs typically bill $200 or more without insurance. Insurance is not required — pay one all-in price.
No fasting required for the Biotin (Vitamin B7). Stop biotin supplements at least 72 hours before testing.
The Biotin (Vitamin B7) is available at Quest 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.
Ordered directly, a Biotin (Vitamin B7) test lists at $79.00 at Quest Health (Quest Diagnostics' own site) and $79.00 at Labcorp OnDemand (prices checked September 2026). TestWell orders the same test at the same Quest patient service centers for $259.99 — $265.99 all-in with the $6 per-order lab processing fee — paid out of pocket at checkout with no insurance, doctor's visit or draw fee; HSA and FSA cards are accepted.
The Biotin (Vitamin B7) test is Quest Diagnostics test code 391. TestWell orders it under that code for $259.99 at Quest — no doctor's visit or insurance required, results in 3–7 business days. Codes verified against the labs' catalogs in 2026.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
TestWell Price
$259.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
Frequently ordered together
Customers who ordered Biotin (Vitamin B7) also added these for a more complete health picture.
Not sure where to start?
Biotin (Vitamin B7)
$259.99