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Vascular ultrasound · Patient guide

Doppler test, ultrasound with flow analysis — from carotid stroke prevention to venous DVT diagnosis.

A Doppler test uses ultrasound with colour and spectral Doppler to assess blood flow through arteries and veins. Applications range from carotid stroke prevention to lower-limb DVT diagnosis, aortic aneurysm surveillance and hepatic-portal flow.

See indicative pricing
A vascular radiologist performing a Doppler ultrasound in a private London clinic

Why patients choose us

  • 01

    The right hands

    We route you to a consultant vascular radiologist or accredited vascular scientist — the person who scans you and reads it decides the answer.

  • 02

    Often answers same-day

    Findings can frequently be discussed immediately, with the written report to follow.

  • 03

    Independent, and free

    We are paid by no clinic, so the recommendation is impartial and costs you nothing.

Key facts

A Doppler test in six lines.

What the test is, what it uses, how long it takes and where it sits in the wider vascular pathway.

  • Definition

    Ultrasound with colour and spectral Doppler for flow analysis across arteries and veins.

  • Radiation-free

    Sound waves only — no ionising radiation, no dye, and safe at any age or in pregnancy.

  • 20–30 minute test

    Most single-region Doppler studies are done in a single appointment window.

  • Common studies

    Carotid, lower-limb venous, arterial ABI, aorta, portal, renal, transcranial.

  • Complements CT / MRA

    A first-line vascular test, with CT or MR angiography as cross-sectional follow-on.

  • Same-day report

    A written consultant report on the same day at private centres.

Indicative pricing

What a private Doppler test costs in London.

Indicative ranges across our partner clinics. Send the details and we quote firm figures across two or three options.

In short

A standard single-region Doppler in our network: £250–£550, with findings often the same day.

Scan type Indicative range
Carotid Doppler £250–£450
Lower-limb venous Doppler (DVT) £280–£500
Arterial Doppler with ABI £300–£550
Aortic Doppler / AAA surveillance £280–£500
Renal or portal / hepatic Doppler £350–£650
Transcranial Doppler £400–£750

Prices vary by clinic, region scanned, and whether a same-visit consultant vascular opinion is included. We come back with a firm quote within one working day.

Diagnostic steps

From referral to report — what happens, in order.

One clinician from first message to report — often within days.

  1. 01

    Before

    Consultation and referral

    A short, confidential form or GP referral. Symptoms, vascular risk factors, prior imaging.

  2. 02

    Before

    Test-specific preparation

    Most Doppler studies need none. Aortic and mesenteric studies require a 6-hour fast.

  3. 03

    On the day

    Change into a gown

    Access to the region being scanned — neck, limb, abdomen or pelvis as appropriate.

  4. 04

    On the day

    Doppler probe applied with gel

    A handheld probe and warm gel on the skin — painless, radiation-free, no needles.

  5. 05

    On the day

    Colour and spectral Doppler images

    B-mode anatomy, colour flow mapping and spectral waveform capture through each vessel.

  6. 06

    On the day

    Duplex quantification of stenosis

    Peak systolic velocity and validated criteria translate flow disturbance into a stenosis grade.

  7. 07

    After

    Consultant report

    A written report with the impression, next step and onward vascular pathway if needed.

Typical end-to-end: 3–7 days. Urgent cases: same day.

What it shows

When a Doppler test is the right test.

Doppler answers a specific vascular question — where the flow is, how fast it is, and what that means for disease. These are the presentations we see most.

  • Carotid stenosis (stroke prevention)

    Quantifies neck-vessel narrowing to guide antiplatelet therapy or surgery.

  • Lower-limb DVT

    Compression and colour Doppler diagnose deep vein thrombosis of the leg.

  • Peripheral arterial disease (ABI)

    Ankle–brachial index and waveforms characterise lower-limb arterial disease.

  • Aortic aneurysm size

    Measures abdominal aortic diameter for AAA screening and surveillance.

  • Hepatic and portal vein flow

    Direction, velocity and patency of portal and hepatic venous circulation.

  • Renal artery stenosis

    Screens for renovascular disease in resistant hypertension or unexplained AKI.

  • Erectile-dysfunction penile Doppler

    Post-injection cavernosal flow assessment for vasculogenic ED.

  • Red flag: acute proximal DVT — anticoagulation pathway

    A confirmed proximal DVT starts anticoagulation the same day — do not wait.

Next steps

What happens after the Doppler.

The report is a step, not the destination. Depending on findings, one of these onward pathways starts.

  • Reassurance if normal

    A clear scan with no significant flow abnormality — the answer, and often the end of the pathway.

  • Antiplatelet / statin for atherosclerosis

    Cardiovascular risk-reduction pathway triggered by clinically significant plaque or stenosis.

  • Anticoagulation for DVT

    Same-day anticoagulation for confirmed deep vein thrombosis, per NICE VTE guidance.

  • Compression stockings for venous disease

    Graduated compression for chronic venous insufficiency, varicose veins or post-thrombotic syndrome.

  • Vascular surgery referral

    Onward referral for endarterectomy, endovenous ablation, stenting or open reconstruction.

  • Repeat surveillance imaging

    Interval Doppler follow-up for AAA, post-endarterectomy, stent grafts or borderline stenosis.

  • Cardiovascular risk reduction

    Blood pressure, lipids, glycaemic control and smoking cessation as a rounded package.

  • Structured vascular follow-up

    A named vascular consultant, clear intervals, and a defined endpoint for surveillance.

Our vetted London network

A small panel of clinics, we picked them.

Partners across central, north, west and south London. Not listed publicly — introductions are made privately, once we understand your case.

Selection criteria

How we choose every clinic in our network.

A modern London vascular ultrasound room with a current-generation Doppler scanner
Consultant vascular radiologists

  • Consultant vascular radiologists or accredited vascular scientists

  • Standardised velocity criteria (NASCET, SVU) for stenosis quantification

  • Same-day report, with images available for onward review

  • Onward vascular-surgery, stroke or interventional pathway if significant disease is found

Red flags

When a Doppler finding is a same-day decision.

Doppler is safe — but some findings are urgent. These are the ones that trigger a same-day surgical, stroke or anticoagulation pathway.

  • Acute proximal DVT

    A confirmed proximal DVT is a same-day anticoagulation decision, not a wait-and-see.

  • Iliofemoral DVT with limb swelling

    Extensive iliofemoral thrombus with a swollen, painful leg needs urgent vascular input.

  • Carotid stenosis + TIA

    Symptomatic 50–99% stenosis is a rapid-access stroke-team and surgical pathway.

  • Ruptured or symptomatic AAA

    Back or abdominal pain with a known or newly-found AAA is a 999 call.

  • Critical limb ischaemia

    Rest pain, tissue loss or gangrene needs same-day vascular assessment.

  • Portal vein thrombosis

    Acute portal vein thrombus needs anticoagulation and hepatology / vascular review.

  • Renal artery stenosis with resistant hypertension

    Suspicious flow with uncontrolled BP triggers renal / vascular referral.

  • Popliteal aneurysm

    Aneurysmal popliteal artery — bilateral assessment and vascular-surgery referral.

  • Post-op vascular graft failure

    Loss of flow, stenosis or occlusion in a bypass or stent graft — urgent surgical input.

Reading your report

A Doppler report can look intimidating. It isn’t.

Whatever the finding, the report keeps to the same four parts.

A consultant vascular radiologist reviewing Doppler images on a clinical workstation at a UK private clinic

A quiet reminder

The report is written for your doctor, not for you — and that’s normal.

If you would like us to talk you through it before your follow-up, just ask.

  1. 01 Header

    Indication and risk factors

    Your details, the reason for the Doppler, and the vascular risk factors that shape interpretation.

  2. 02 Technique

    Region, probes and Doppler settings

    Which vessels were interrogated, with which probe, and the velocity method used.

  3. 03 Findings

    Velocities, plaque, thrombus, stenosis %

    Vessel-by-vessel description: PSV, plaque or thrombus, and validated stenosis percentages.

  4. 04 Impression

    The conclusion: read this first

    Normal, mild/moderate/severe disease, and the concrete next step — read this first.

Recognised by major UK insurers

BupaAXA HealthVitalityAvivaWPACignaHealixBupaAXA HealthVitalityAvivaWPACignaHealixBupaAXA HealthVitalityAvivaWPACignaHealix

Cover depends on your policy and clinic; we confirm with your insurer before booking.

Frequently asked

Everything we get asked about Doppler tests.

Quick answers on regions scanned, how Doppler differs from standard ultrasound, preparation, safety in pregnancy, and DVT pathways.

  • What is a Doppler test?

    A Doppler test is an ultrasound study that uses colour and spectral Doppler to assess blood flow through arteries and veins. It quantifies stenosis, detects thrombus, and characterises flow patterns without radiation or dye.

  • What areas of the body can a Doppler test scan?

    The most common Doppler studies are carotid (neck), lower-limb venous (for DVT), lower-limb arterial with ABI, abdominal aorta, hepatic and portal veins, renal arteries, and transcranial. A penile Doppler is used for vasculogenic erectile dysfunction.

  • How is a Doppler test different from a standard ultrasound?

    Standard ultrasound (B-mode) shows anatomy — the shape and texture of a vessel or organ. Doppler adds colour and spectral analysis of blood flow, so it shows direction, velocity and any turbulence, which is what identifies stenosis, occlusion or thrombus.

  • Do I need to prepare for a Doppler test?

    Most Doppler studies need no preparation. Aortic and mesenteric Doppler studies usually require a 6-hour fast to reduce bowel gas. We confirm the specific instructions when we book.

  • Is a Doppler test safe in pregnancy?

    Entirely safe — ultrasound uses sound waves, not radiation, and Doppler is used routinely in obstetric imaging. There is no known risk to the pregnancy.

  • What happens if the Doppler finds a DVT?

    A confirmed proximal DVT starts anticoagulation the same day, in line with NICE VTE guidance (NG158). We route you directly into a DVT pathway — the report is not the end of the process.

Sources

Guidelines this page follows.

Reviewed 2026-07-30 by Pulse Atlas Editorial Board, . Next review 2027-07-30.

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In practice, in London

The London pathway for doppler test

With doppler test, the London question is usually about report turnaround and the radiologist reading it — not whether the scan is available. On the NHS, doppler test typically sits behind a triage step and a wait that can stretch from a few weeks into months. In London’s private sector, the same appointment often lands within days. That speed matters when symptoms are disrupting work, sleep, or a plan you’d already committed to — and it’s the single most common reason people call us in the first place.

In practice, a private doppler test appointment in London means a named consultant, a proper hour in the room (or the equivalent on a video call), and a report you can actually read. Most of the imaging suites and endoscopy units we use sit within a mile of Harley Street or in Chelsea and Fulham, and turnaround on findings is measured in days, not weeks. For doppler test specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.

Fit matters more than people expect. For doppler test, the right consultant depends on what you actually need — a second opinion, a definitive diagnosis, a bridge into treatment, or reassurance that nothing’s being missed. We match on that, not on who has the biggest brochure. If a test isn’t the right next step, we’ll say so before you book anything.

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