On your lab requisition: Quest “D-Dimer, Quantitative” (test code 8659)
The short answer
Detects fibrin degradation in your blood — used to rule out blood clots like DVT or pulmonary embolism, measured from a standard blood draw. At TestWell it costs $69.99 plus a $6 lab processing fee, needs no fasting, and results post in 1–3 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp.
Hospital Lab
$130
cash pay
Other Labs
$111
+ lab fees
TestWell
$69.99
+ $6 lab processing fee
D-Dimer is a small protein fragment produced when a blood clot breaks down through fibrinolysis. Elevated D-Dimer levels indicate that abnormal clotting and clot breakdown are happening somewhere in the body. The test is most often used to rule out venous thromboembolism (VTE) — including deep vein thrombosis (DVT) and pulmonary embolism (PE) — in patients with a low clinical pretest probability. A negative D-Dimer in a low-risk patient effectively excludes VTE without further imaging. D-Dimer is also used to monitor disseminated intravascular coagulation (DIC), assess recurrent VTE risk after stopping anticoagulation, and evaluate ongoing fibrinolysis. Note: D-Dimer is sensitive but not specific — it can be elevated in pregnancy, post-surgery, infection, malignancy, and aging, so an elevated result requires clinical context.
Measures fibrin degradation fragments released when a blood clot breaks down. Primarily used to help rule out venous thromboembolism — deep vein thrombosis (DVT) and pulmonary embolism (PE) — and to monitor clotting activity.
People whose clinician suggested clot rule-out monitoring, those with a personal or family history of clotting events tracking a baseline, and anyone re-checking levels after completing anticoagulation under medical guidance.
Sample Type
Blood draw
Fasting
Not required
Results In
1–3 business days · typical; varies by lab and draw day
Performed At
Quest or Labcorp
Your D-Dimer 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 1–3 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.
No fasting required. Take your normal medications. Inform the lab if you've had recent surgery, are pregnant, or have an active infection — these can elevate D-Dimer naturally.
The short answer
Situational, and safety comes first: if you have sudden leg swelling and pain, chest pain, or shortness of breath, do not order a test online - go to an emergency room now. Ordered with a provider's guidance, a D-Dimer is a useful rule-out for blood clots, but it is not a self-diagnosis tool for an acute emergency.
We would rather you order the right test than the most expensive one.
D-Dimer is a standard venous blood draw at Quest or Labcorp, or an at-home mobile draw where available. Because Quest Direct and Labcorp OnDemand do not sell D-Dimer to consumers, third-party resellers charge $111+; TestWell runs the identical Quest/Labcorp assay for $69.99. Turnaround is 1-3 business days - which is exactly why it is the wrong tool for a suspected acute clot, where you need an ER and imaging the same hour.
The markers that matter most and what an out-of-range value can mean. Reference ranges vary by lab, age and sex.
| Marker | Typical range | What it means |
|---|---|---|
| D-Dimer | Under 0.50 mcg/mL FEU (age-adjusted) | A normal (low) result makes an active clot unlikely - its strength is ruling clots out. A high result is non-specific: clots raise it, but so do infection, recent surgery, pregnancy, age, and inflammation, so an elevated value needs clinical follow-up, not panic. |
This section medically reviewed by Youmna DiStefano, MD — updated July 2026. General health information, not medical advice; interpret results with a qualified clinician.
TestWell orders the same D-Dimer the labs run for doctors' offices, so you can walk into any of these labs with our requisition — no doctor's visit, a licensed physician authorizes the order, and most patient service centers take walk-ins. The table shows each lab's own test code, the name printed on the requisition, what the lab charges on its own consumer site, and the price through TestWell at that lab (plus one $6 fee per order).
| Lab | Test code | On the requisition | Lab's own site | Through TestWell |
|---|---|---|---|---|
| Quest Diagnostics | test code 8659 | “D-Dimer, Quantitative” | not sold direct | $69.99 + $6 |
| Labcorp | test no. 115188 | “D-Dimer” | not sold direct | $69.99 + $6 |
| BioReference (New York & New Jersey) | test code 5743-0 | “D-Dimer” | n/a | $34.99 + $6 |
You choose the lab at checkout; the requisition is written for that lab and arrives by email within minutes. New York and New Jersey orders draw at BioReference. Lab-direct prices are read from the labs' public pages and re-checked regularly.
Where to get it near you: patient service centers by state and city · search by ZIP code
A D-Dimer test costs $69.99 at TestWell — $75.99 all-in, since the $6 lab processing fee is charged once per order and there is no draw or physician fee. Hospital outpatient labs typically bill around $130.00 self-pay. With insurance you pay your plan's negotiated rate against your deductible; TestWell's price is fixed before the draw and HSA/FSA-eligible.
| Where you order | Price | One test, all-in | Notes |
|---|---|---|---|
| TestWell (drawn at Quest or Labcorp) | $69.99 | $75.99 | Includes the one $6 lab processing fee, charged once per order |
| TestWell (drawn at BioReference — New York & New Jersey) | $34.99 | $40.99 | New York and New Jersey orders route to BioReference; Quest Health and Labcorp OnDemand don't take self-ordered draws in those states |
| Hospital outpatient lab, self-pay (typical) | $130.00 | $130.00 | Reference figure; hospital charges vary widely by facility and are often higher |
Lab test codes: Quest test code 8659 · Labcorp test no. 115188 · BioReference code 5743-0. 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
D-Dimer is a protein fragment produced when a blood clot dissolves. Nearly undetectable in most healthy people, it rises when significant clot formation and breakdown are happening somewhere in the body — which is why it's the standard first-line blood test when a clot is suspected.
Most labs use a cutoff around 0.50 mg/L FEU (500 ng/mL) — results below that are considered negative. Because D-Dimer rises naturally with age, clinicians often apply an age-adjusted cutoff (age × 10 ng/mL for people over 50). Your report will show the exact reference range for the lab that ran your sample.
No — it's a rule-out test, not a rule-in test. A negative D-Dimer in a low-risk person makes an active clot very unlikely. An elevated result does NOT confirm a clot: age, pregnancy, recent surgery, infection, and inflammation all raise D-Dimer. Elevated results need clinical follow-up, usually imaging like ultrasound or CT angiography. If you have symptoms like leg swelling, chest pain, or shortness of breath, seek immediate medical care rather than waiting on lab work.
On TestWell, the quantitative D-Dimer is $69.99 ($34.99 for NY/NJ via BioReference). Quest Health and Labcorp OnDemand don't sell D-Dimer to consumers at all — third-party resellers charge $111.90-$128 for the same test at the same labs, and hospital labs typically bill $130+.
Quantitative D-Dimer is billed under CPT 85379. Cash-pay patients don't need the code to order through TestWell — it's listed for records and HSA/FSA reimbursement.
No fasting required, and you should take your normal medications. Tell the lab if you've had surgery recently, are pregnant, or have an active infection — all three can elevate D-Dimer without any clot being present.
For a broader clotting and inflammation picture, D-Dimer is often ordered alongside Fibrinogen Activity (the clotting protein D-Dimer derives from), a CBC with Differential (platelet count), and hs-CRP (systemic inflammation, which can elevate D-Dimer). All can be drawn in the same visit.
No. If you have symptoms of a clot - sudden one-sided leg swelling or pain, chest pain, or shortness of breath - go to an emergency room immediately. A D-Dimer takes 1-3 business days to result and is only meaningful alongside a clinical risk assessment and imaging. Online lab testing is for planned, non-emergency situations.
Quest Direct and Labcorp OnDemand do not offer D-Dimer to consumers at all, so the only other way to buy it yourself is through third-party resellers that mark it up to $111-$128. TestWell orders the same test at the same Quest or Labcorp lab for $69.99 because the physician authorization and lab access are built in rather than resold.
D-Dimer measures a breakdown product of blood clots, so it rises when clotting is active - but it also rises with infection, recent surgery or injury, pregnancy, liver disease, and simply older age. That makes it excellent at ruling clots out when normal, but a high value on its own does not diagnose a clot; it is a prompt for clinical evaluation.
D-Dimer test results are typically ready in 1–3 business days after your draw at Quest or Labcorp. TestWell emails you the moment they post, and your results dashboard shows each marker against its reference range with a plain-English explanation.
Order the D-Dimer test online from TestWell for $69.99 (plus a $6 per-order lab processing fee) — no doctor's visit, referral or insurance needed. A licensed physician authorizes the order, then you walk into any Quest or Labcorp patient service center near you for the draw (the lab locator on our site lists the closest ones by ZIP code), and results arrive in 1–3 business days.
The D-Dimer test is Quest Diagnostics test code 8659 ("D-Dimer, Quantitative"), Labcorp test number 115188, BioReference code 5743-0 (CPT 85379). TestWell orders it under those codes for $69.99 at Quest, Labcorp or BioReference — no doctor's visit or insurance required, results in 1–3 business days. Codes verified against the labs' catalogs in 2026.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
Related guide
How Much Does a D-Dimer Test Cost? ER, Urgent Care and Lab Prices — and When Price Should Not Be the Question
TestWell Price
$69.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
Frequently ordered together
Customers who ordered D-Dimer also added these for a more complete health picture.
Not sure where to start?
D-Dimer
$69.99