What is the Quest Diagnostics test code for a PT/INR test?

Quest Diagnostics test code 8847. On a Quest Diagnostics requisition the test is printed as "Prothrombin Time with INR", billing code CPT 85610. 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 PT/INR 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, buy the test on Quest Health ($42.00), or order through TestWell ($23.99 + $6 fee), where a licensed physician in our network authorizes the order and the Quest Diagnostics requisition arrives by email, usually within minutes. 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. Take your usual medications including blood thinners.

How long do Quest Diagnostics PT/INR results take?

Results post to your TestWell portal in 1–3 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 PT/INR test.

Is a PT/INR test cheaper at Quest Diagnostics or Labcorp?

Through TestWell the price is the same $23.99 at either lab — pick the location that is convenient; the requisition is written for the lab you choose. On the labs' own consumer sites, Quest Health lists it at $42.00 and Labcorp OnDemand at $39.00 — Labcorp OnDemand is the lower lab-direct price. See the Labcorp page for that side of the comparison.

Prothrombin Time with INR at Quest Diagnostics: test code, price, and how to order

Quest Health, Quest Diagnostics's own consumer site, lists the PT/INR test at $42.00 (list price checked Oct 10, 2026). Through TestWell the same Quest Diagnostics draw is $23.99 plus one $6 lab processing fee — $29.99 all-in, $12.01 less for a single test, and the fee is per order, so adding tests widens the gap. Either way you walk into a Quest Diagnostics patient service center with a requisition — through TestWell a licensed physician authorizes the order, no doctor's visit needed.

$29.99 all-in for one test · choose Quest Diagnostics at checkout · results in 1–3 business days · no fasting

PT/INR at Quest Diagnostics at a glance

Quest Diagnostics test code	8847
On the requisition	“Prothrombin Time with INR” · CPT 85610
Quest Health price (Quest Diagnostics's own site)	$42.00 · list price checked Oct 10, 2026
Through TestWell, drawn at Quest Diagnostics	$23.99 + $6 lab processing fee (once per order) = $29.99 for one test
Sample · fasting · results	Blood draw · no fasting · 1–3 business days

$12.01 less than Quest Health for a single test; the fee is per order, so the difference grows with each test added. Lab-direct prices are read from the linked public page and re-checked regularly; the lab's site may add fees at checkout or change prices without notice.

Better value: the Blood Clotting Panel

Save $50.97

This test is part of the Blood Clotting Panel — 4 tests · 18 biomarkers for $149.99, $50.97 less than à la carte.

$149.99$200.96

4 tests · 18 biomarkers

Three ways to get a PT/INR 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 8847 if you want the same test.
On Quest Health. Quest Diagnostics's consumer site sells the PT/INR test at $42.00 (list price, checked Oct 10, 2026); a physician network authorizes it and you draw at a Quest Diagnostics center. Check their checkout for any service fee.
Through TestWell. $23.99 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 1–3 business days. Add tests to the same draw without another fee.

How to walk into Quest Diagnostics with a TestWell order

Add the PT/INR 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 1–3 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 PT/INR 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 PT/INR result covers

2 markers: Prothrombin Time, INR. Measures blood clotting time — essential for patients on blood thinners like Warfarin. Full test details, reference ranges and reviews · same test at Labcorp.

Frequently asked questions

How much is a PT/INR test at Quest Diagnostics?: Quest Health, Quest Diagnostics's own consumer site, lists the PT/INR test at $42.00 (list price checked Oct 10, 2026). Through TestWell the same Quest Diagnostics draw is $23.99 plus one $6 lab processing fee — $29.99 all-in, $12.01 less for a single test, and the fee is per order, so adding tests widens the gap. Either way you walk into a Quest Diagnostics patient service center with a requisition — through TestWell a licensed physician authorizes the order, no doctor's visit needed.
What is the Quest Diagnostics test code for a PT/INR test?: Quest Diagnostics test code 8847. On a Quest Diagnostics requisition the test is printed as "Prothrombin Time with INR", billing code CPT 85610. 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 PT/INR 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, buy the test on Quest Health ($42.00), or order through TestWell ($23.99 + $6 fee), where a licensed physician in our network authorizes the order and the Quest Diagnostics requisition arrives by email, usually within minutes. 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. Take your usual medications including blood thinners.
How long do Quest Diagnostics PT/INR results take?: Results post to your TestWell portal in 1–3 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 PT/INR test.
Is a PT/INR test cheaper at Quest Diagnostics or Labcorp?: Through TestWell the price is the same $23.99 at either lab — pick the location that is convenient; the requisition is written for the lab you choose. On the labs' own consumer sites, Quest Health lists it at $42.00 and Labcorp OnDemand at $39.00 — Labcorp OnDemand is the lower lab-direct price. See the Labcorp page for that side of the comparison.

Order the PT/INR test — $23.99 at Quest Diagnostics