VENOUS COLOUR DOPPLER ULTRASOUND SCAN

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About The Test

What the test evaluates

  • Detects deep-vein thrombosis (DVT) and superficial clots
  • Measures blood-flow direction and speed
  • Assesses vein wall compressibility and valve function

Why Cadabams Diagnostics is trusted

  • 25+ years of imaging excellence
  • NABL-accredited labs & ICMR-approved protocols
  • Same-day soft-copy reports via secure email

What is Venous Colour Doppler Ultrasound Scan?

Definition and technology behind colour Doppler

A venous colour Doppler scan is a real-time ultrasound that adds colour-coded images to show blood moving toward or away from the probe. This lets the technologist “see” clots, reflux, or blockages that standard black-and-white ultrasound can miss.

Difference between standard ultrasound and colour Doppler

Feature Standard Ultrasound Colour Doppler
Shows anatomy Yes Yes
Shows blood flow No Yes (colour)
Detects clots Limited High accuracy

Types of Venous Colour Doppler Ultrasound Scan

  • Upper-limb venous Doppler – arms, subclavian, jugular veins
  • Lower-limb venous Doppler – thighs, calves, popliteal veins
  • Whole-leg vs targeted segmental studies – chosen by the radiologist based on symptoms

List of Parameters

  • Vein compressibility – healthy veins collapse under probe pressure
  • Blood flow direction & velocity – checks for reflux or obstruction
  • Presence of thrombus or reflux – clot seen as a filling defect
  • Valve competency – valves should prevent backward flow

Why This Test

  • Rule out DVT before long flights or surgery
  • Assess chronic venous insufficiency causing leg ulcers
  • Pre-operative mapping for varicose-vein surgery

When to Take Test

Symptoms indicating a venous scan

  • Sudden leg pain or heaviness
  • Swelling in one limb
  • Warmth or redness over a vein
  • Visible varicose veins or skin ulcers

At-risk populations

  • Post-surgery patients on bed rest
  • Pregnancy (hormonal changes + pressure on pelvic veins)
  • Sedentary office workers or long-haul travelers
  • Smokers, cancer patients, or those on hormone therapy

Benefits

Benefits of Taking the Venous Colour Doppler Ultrasound Scan

  • Non-invasive and painless – just gel and gentle probe pressure
  • Real-time results – see blood flow instantly on screen
  • Zero radiation – repeat as often as needed

Illnesses Diagnosed with Venous Colour Doppler Ultrasound Scan

  • Deep Vein Thrombosis (DVT)
  • Varicose veins & venous reflux
  • Superficial thrombophlebitis
  • Venous malformations or arteriovenous fistulas

Preparing for test

  • Wear loose clothing; remove jewellery from limbs
  • Fasting is not required – eat and drink normally
  • Bring doctor’s referral and any previous scan reports

Pre-requisites Venous Colour Doppler Ultrasound Scan

  • Doctor’s prescription (as per insurer or hospital protocol)
  • Clean, dry skin on the limb to be scanned—avoid lotions

Best Time to Take the Venous Colour Doppler Ultrasound Scan

  • Morning slots reduce leg swelling from day-long standing
  • Urgent booking within 24 h if acute DVT is suspected

Eligibility

  • Adults of all ages
  • Safe in pregnancy – no radiation risk
  • Pediatric scans on physician request (smaller probe used)

Procedure for Taking a Venous Colour Doppler Ultrasound Scan

  1. Duration: 30–45 minutes
  2. Position: Lie on your back; the limb may be slightly rotated
  3. Gel application: Water-based gel helps sound waves travel
  4. Probe movement: Technologist glides the probe along veins; you may hear “whooshing” sounds representing blood flow

Caution Before Taking the Test

  • Inform staff of any contrast allergies (rarely used)
  • Remove compression stockings 2 h before the exam to avoid false-negative results

Test Results

Results and Interpretations

Finding / ObservationDescription General Interpretation / Significance
Normal compressibilityVein collapses fully with probe pressureNo clot
Absent flow signalNo colour or spectral Doppler signalPossible DVT
Reversed flowColour shows blood moving backwardValve incompetence / reflux
Echogenic massBright, solid area within vein lumenThrombus present

Risks & Limitations

Minimal risk profile

  • No radiation, no needles, no contrast dye
  • Safe for pregnant women and kidney-compromised patients

Limitations

  • Obesity or severe edema can blur images
  • Very small calf veins may need follow-up MRI or venography

FAQs

Is the scan painful?

No—just cool gel and gentle pressure.

How soon can I resume normal activities?

Immediately; no downtime.

What clothing should I wear?

Loose-fitting clothes that can be rolled up above the knee or elbow.

Will insurance cover the test?

Most insurers reimburse—our front desk assists with cashless or reimbursement forms.

Can I eat or drink beforehand?

Yes, no fasting needed.

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