What is the Quest Diagnostics test code for a Vitamin B2 test?

Quest Diagnostics test code 36399. On a Quest Diagnostics requisition the test is printed as "Vitamin B2 (Riboflavin)", billing code CPT 84252. If you are holding a doctor's order, that is the line to look for; a TestWell requisition carries the same code.

Do I need an appointment at Quest Diagnostics?

Most Quest Diagnostics patient service centers take walk-ins, and an appointment on Quest Diagnostics's site shortens the wait. Bring a photo ID and the emailed requisition (on your phone is fine). No fasting is required for this test. No fasting required. No special preparation needed.

How long do Quest Diagnostics Vitamin B2 results take?

Results post to your TestWell portal in 3–5 business days after the draw, with reference ranges and the option to share them with your clinician. Quest Diagnostics runs the sample in its own CLIA-certified laboratory whichever way it was ordered, so the result and the turnaround are the same as a doctor-ordered Vitamin B2 test.

Is a Vitamin B2 test cheaper at Quest Diagnostics or Labcorp?

Through TestWell this test is drawn at Quest Diagnostics only ($66.99 + $6 fee); it is not offered at Labcorp. Quest Health does not list it for consumers.

Can I buy a Vitamin B2 test on Quest Health?

Not as of our last catalog match (Sep 12, 2026) — Quest Health did not list the Vitamin B2 test among the tests it sells to consumers. A doctor's order or a TestWell order ($66.99 + $6 fee) are the routes, and both are drawn at the same Quest Diagnostics patient service centers and run in the same Quest Diagnostics laboratory under test code 36399.

Vitamin B2 (Riboflavin) at Quest Diagnostics: test code, price, and how to order

Quest Health, Quest Diagnostics's own consumer site, does not sell the Vitamin B2 test (we last matched its catalog on Sep 12, 2026), so there is no walk-up consumer price at Quest Diagnostics itself. Two routes get it drawn there: a doctor's order, billed to insurance or at the lab's self-pay rate, or TestWell — $66.99 plus one $6 lab processing fee, $72.99 all-in for one test — where a licensed physician authorizes the order and the Quest Diagnostics requisition arrives by email. The collection, the Quest Diagnostics laboratory and the result are the same either way.

Vitamin B2 Test (Riboflavin) — full details, FAQs and results · $72.99 all-in for one test · choose Quest Diagnostics at checkout · results in 3–5 business days · no fasting

Vitamin B2 at Quest Diagnostics at a glance

Quest Diagnostics test code	36399
On the requisition	“Vitamin B2 (Riboflavin)” · CPT 84252
Quest Health price (Quest Diagnostics's own site)	Not sold to consumers on Quest Health (catalog matched Sep 12, 2026)
Through TestWell, drawn at Quest Diagnostics	$66.99 + $6 lab processing fee (once per order) = $72.99 for one test
Sample · fasting · results	Blood draw · no fasting · 3–5 business days

Quest Health does not list this test, so the TestWell price is the self-ordered price at Quest Diagnostics; a doctor-ordered draw is billed through insurance or at the lab's self-pay rate. We re-match Quest Health's catalog periodically; if the lab starts selling this test direct, its price will appear here.

Two ways to get a Vitamin B2 test at Quest Diagnostics

With a doctor's order. Your clinician sends a requisition to Quest Diagnostics; the lab bills your insurance and your share depends on your plan and deductible. Ask for the Quest Diagnostics test code 36399 if you want the same test.
Through TestWell. $66.99 plus one $6 fee per order. A licensed physician in our network authorizes the order, the Quest Diagnostics requisition arrives by email (usually within minutes), you walk into any Quest Diagnostics patient service center, and results post to your portal in 3–5 business days. Add tests to the same draw without another fee.

Quest Health, Quest Diagnostics's own consumer ordering site, did not list the Vitamin B2 test when we last matched its catalog (Sep 12, 2026) — so there is no “buy it on the lab's site” route for this test.

How to walk into Quest Diagnostics with a TestWell order

Add the Vitamin B2 test to your cart, choose Quest Diagnostics at checkout, and pay — a physician authorizes the order, usually within minutes.
Open the emailed requisition on your phone (or print it) and bring a photo ID.
Walk into any Quest Diagnostics patient service center; most take walk-ins, and an appointment on Quest Diagnostics's site shortens the wait.
Results post to your TestWell portal in 3–5 business days, with reference ranges and a share link for your clinician.

In New York or New Jersey? Neither Quest nor Labcorp takes self-ordered draws there; TestWell routes those orders to BioReference automatically.

Where to get a Vitamin B2 test at Quest Diagnostics

Quest Diagnostics runs 418 patient service centers across the 45 metros TestWell tracks (snapshot Oct 10, 2026); the TestWell requisition is accepted at all of them. Metros with the most Quest Diagnostics sites:

All states and cities · Search by ZIP code

What the Quest Diagnostics Vitamin B2 result covers

One marker: Vitamin B2 (Riboflavin). Measures riboflavin levels — involved in energy production and cellular function. Full test details, reference ranges and reviews.

Frequently asked questions

How much is a Vitamin B2 test at Quest Diagnostics?: Quest Health, Quest Diagnostics's own consumer site, does not sell the Vitamin B2 test (we last matched its catalog on Sep 12, 2026), so there is no walk-up consumer price at Quest Diagnostics itself. Two routes get it drawn there: a doctor's order, billed to insurance or at the lab's self-pay rate, or TestWell — $66.99 plus one $6 lab processing fee, $72.99 all-in for one test — where a licensed physician authorizes the order and the Quest Diagnostics requisition arrives by email. The collection, the Quest Diagnostics laboratory and the result are the same either way.
What is the Quest Diagnostics test code for a Vitamin B2 test?: Quest Diagnostics test code 36399. On a Quest Diagnostics requisition the test is printed as "Vitamin B2 (Riboflavin)", billing code CPT 84252. If you are holding a doctor's order, that is the line to look for; a TestWell requisition carries the same code.
Can I walk into Quest Diagnostics for a Vitamin B2 test without a doctor?: Yes, with a requisition. Quest Diagnostics patient service centers draw what a requisition orders; they do not write orders. You can get one from your doctor, or order through TestWell ($66.99 + $6 fee), where a licensed physician in our network authorizes the order and the Quest Diagnostics requisition arrives by email, usually within minutes. Quest Health does not list this test, so TestWell is the self-ordered route at Quest Diagnostics. New York and New Jersey do not allow self-ordered draws at Quest or Labcorp; TestWell orders from those states route to BioReference instead.
Do I need an appointment at Quest Diagnostics?: Most Quest Diagnostics patient service centers take walk-ins, and an appointment on Quest Diagnostics's site shortens the wait. Bring a photo ID and the emailed requisition (on your phone is fine). No fasting is required for this test. No fasting required. No special preparation needed.
How long do Quest Diagnostics Vitamin B2 results take?: Results post to your TestWell portal in 3–5 business days after the draw, with reference ranges and the option to share them with your clinician. Quest Diagnostics runs the sample in its own CLIA-certified laboratory whichever way it was ordered, so the result and the turnaround are the same as a doctor-ordered Vitamin B2 test.
Is a Vitamin B2 test cheaper at Quest Diagnostics or Labcorp?: Through TestWell this test is drawn at Quest Diagnostics only ($66.99 + $6 fee); it is not offered at Labcorp. Quest Health does not list it for consumers.
Can I buy a Vitamin B2 test on Quest Health?: Not as of our last catalog match (Sep 12, 2026) — Quest Health did not list the Vitamin B2 test among the tests it sells to consumers. A doctor's order or a TestWell order ($66.99 + $6 fee) are the routes, and both are drawn at the same Quest Diagnostics patient service centers and run in the same Quest Diagnostics laboratory under test code 36399.

Order the Vitamin B2 test — $66.99 at Quest Diagnostics